Surgical instruments with electrodes

ABSTRACT

An end-effector assembly configured to be attached to a surgical instrument. The end-effector assembly comprises a first jaw and a second jaw comprising a staple cavity. At least one of the first jaw and the second jaw is movable relative to the other jaw. The end-effector assembly comprises a staple removably positioned within the staple cavity and an electrically-conductive driver configured to move the staple between a first stored position in which the staple is at least partially positioned within the staple cavity and a second position in which the staple is at least partially deployed from the staple cavity into tissue positioned intermediate the first jaw and the second jaw. The staple comprises an electrode.

FIELD

The present disclosure is generally directed to surgical instrumentsand, more particularly, is directed to surgical instruments comprisingelectrodes.

BACKGROUND

In various open, endoscopic, and/or laparoscopic surgeries, for example,it may be desirable to coagulate, seal, and/or fuse tissue. One methodof sealing tissue relies upon the application of energy, such aselectrical energy, for example, to tissue captured or clamped within anend effector or an end-effector assembly of a surgical instrument inorder to cause thermal effects within the tissue. Various mono-polar andbi-polar radio frequency (Rf) surgical instruments and surgicaltechniques have been developed for such purposes. In general, thedelivery of Rf energy to the captured tissue can elevate the temperatureof the tissue and, as a result, the energy can at least partiallydenature proteins within the tissue. Such proteins, like collagen, forexample, can be denatured into a proteinaceous amalgam that intermixesand fuses, or seals, together as the proteins renature. As the treatedregion heals over time, this biological seal may be reabsorbed by thebody's wound healing process.

The foregoing discussion is intended only to illustrate various aspectsof the related art and should not be taken as a disavowal of claimscope.

SUMMARY

In one non-limiting embodiment, the present disclosure, in part, isdirected to an end-effector assembly configured to be attached to asurgical instrument. The end-effector assembly comprises a first jaw anda second jaw comprising a staple cavity. At least one of the first jawand the second jaw is movable relative to the other jaw. Theend-effector assembly comprises a staple removably positioned within thestaple cavity and an electrically-conductive driver configured to movethe staple between a first stored position in which the staple is atleast partially positioned within the staple cavity and a secondposition in which the staple is at least partially deployed from thestaple cavity into tissue positioned intermediate the first jaw and thesecond jaw. The staple comprises an electrode.

In one non-limiting embodiment, the present disclosure, in part, isdirected to an end-effector assembly configured to be engaged with asurgical instrument. The end-effector assembly comprises a first jaw anda second jaw comprising a staple cavity. At least one of the first jawand the second jaw is movable relative to the other jaw. Theend-effector assembly comprises a staple removably positioned within thestaple cavity and an electrically-conductive driver configured to deploythe staple at least partially from the staple cavity into tissuepositioned intermediate the first jaw and the second jaw. The staplecomprises a first electrode one of the first jaw and the second jawcomprises a second electrode.

In one non-limiting embodiment, the present disclosure, in part, isdirected to an end-effector assembly configured to be engaged with asurgical instrument. The end-effector assembly comprises an electrodesystem comprising an electrode and a staple deploying system comprisinga staple cavity, a staple removably positioned within the staple cavity,and a staple driver configured to move the staple between a firstposition in which the staple is stored at least partially within thestaple cavity and a second position in which the staple is at leastpartially deployed from the staple cavity. The end-effector assemblycomprises a staple sensor configured to sense when the staple is in thefirst position, a tissue thickness sensor configured to sense athickness of tissue positioned within the end-effector assembly, and alockout device configured to deactivate the electrode system when thesensed thickness is greater than a predetermined tissue thicknessthreshold and when the staple sensor does not sense the staple in thefirst position.

The foregoing discussion should not be taken as a disavowal of claimscope.

BRIEF DESCRIPTION OF THE DRAWINGS

Various features of the embodiments described herein are set forth withparticularity in the appended claims. The various embodiments, however,both as to organization and methods of operation, together with theadvantages thereof, may be understood in accordance with the followingdescription taken in conjunction with the accompanying drawings asfollows.

FIG. 1 is a perspective view a surgical instrument in accordance withone non-limiting embodiment of the present disclosure;

FIG. 2 is a perspective view of an end-effector of the surgicalinstrument of FIG. 1 in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 3 is an exploded perspective view of the end-effector of FIG. 2 inaccordance with one non-limiting embodiment of the present disclosure;

FIG. 4 is a cut-away perspective view of the surgical instrument of FIG.1 in accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 5 is a cross-sectional view of an end-effector having tissuecompressed between a first portion and a second portion thereof inaccordance with one non-limiting embodiment of the present disclosure;

FIG. 6 is a view of a formed anastomosis in tissue after theend-effector of FIG. 5 has been used in accordance with one non-limitingembodiment of the present disclosure;

FIG. 7 a is a perspective view of an end-effector in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 7 b is a cross-sectional view of the end-effector of FIG. 7 a, whena second portion is attached to a first portion in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 8 a is a perspective view of an end-effector in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 8 b is a cross-sectional view of the end-effector of FIG. 8 a, whena second portion is attached to a first portion in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 9 a is a perspective view of an end-effector in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 9 b is a cross-sectional view of the end-effector of FIG. 9 a, whena second portion is attached to a first portion in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 10 a is a perspective view of an end-effector in accordance withone non-limiting embodiment of the present disclosure;

FIG. 10 b is a cross-sectional view of the end-effector of FIG. 10 a,when a second portion is attached to a first portion in accordance withone non-limiting embodiment of the present disclosure;

FIG. 11 a is a perspective view of an end-effector in accordance withone non-limiting embodiment of the present disclosure;

FIG. 11 b is a cross-sectional view of the end-effector of FIG. 11 a,when a second portion is attached to a first portion in accordance withone non-limiting embodiment of the present disclosure;

FIG. 12 is a perspective view of a staple cartridge configured to beused in a surgical stapling instrument in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 13 is a partial cut-away side view of a surgical instrumentconfigured to cut, staple, and/or seal tissue in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 14 is a cut-away side view of an end-effector assembly of thesurgical instrument of FIG. 13 in accordance with one non-limitingembodiment of the present disclosure;

FIG. 15 is a side view of a cutting member of the end-effector assemblyof the surgical instrument of FIG. 14 in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 16 is a front view of the cutting member of FIG. 15 in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 17 is a cut-away side view of an end-effector assembly with acutting member and a driver in the fully extended position in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 18 is a cut-away side view of a handle portion of the surgicalinstrument of FIG. 13 with a base portion thereof removed and bothtriggers in the non-retracted position in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 19 is an exploded perspective view of the handle portion of thesurgical instrument of FIG. 13 in accordance with one non-limitingembodiment of the present disclosure;

FIG. 20 is a cut-away side view of the handle portion of the surgicalinstrument of FIG. 13 with one of the triggers in the retracted positionand the one of the triggers in the non-retracted position in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 21 is a cut-away side view of the handle portion of the surgicalinstrument of FIG. 13 with both of triggers in the retracted position inaccordance with one non-limiting embodiment of the present disclosure;

FIG. 22 is a perspective view of the end-effector assembly of thesurgical instrument of FIG. 13 in an open configuration in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 23 is an exploded perspective view of a shaft and an end-effectorassembly of the surgical instrument of FIG. 13 in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 24 is a perspective view of the end-effector assembly of thesurgical instrument of FIG. 13 with a staple cartridge partially removedin accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 25 is a perspective view of the end-effector assembly of thesurgical instrument of FIG. 24 with the staple cartridge fully removedin accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 26 is sectional view of the end-effector assembly of FIG. 22 takenalong line 26-26 with a cutting member and a driver in a retractedposition in accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 27 is a sectional view of the end-effector assembly of FIG. 22taken along line 27-27 in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 28 is a sectional view of the end-effector assembly of FIG. 27taken along line 28-28 in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 29 is a cut-away side view of the end-effector assembly of FIG. 13taken along the longitudinal centerline of the end-effector assembly inan open position in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 30 is a partial cut-away side view of the surgical instrument ofFIG. 13 with the end-effector assembly in a closed position inaccordance with one non-limiting embodiment of the present disclosure;

FIG. 31 is a sectional view of the end-effector assembly of FIG. 30taken along the longitudinal centerline of the end-effector assemblywhen tissue positioned within the end-effector is compressed inaccordance with one non-limiting embodiment of the present disclosure;

FIG. 32 is a partial cut-away side view of the surgical instrument ofFIG. 13 in a partially fired positioned in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 33 is a sectional view of the end-effector assembly of FIG. 32taken along the longitudinal centerline of the end-effector assembly ina partially fired position in accordance with one non-limitingembodiment of the present disclosure;

FIG. 34 is a partial cut-away side view of the surgical instrument ofFIG. 13 in a fully fired positioned in accordance with one non-limitingembodiment of the present disclosure;

FIG. 35 is a sectional view of the end-effector assembly of FIG. 34taken along the longitudinal centerline of the end-effector assembly ina fully fired position in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 36 is a schematic illustration of a second jaw of an end-effectorassembly in accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 37 is a schematic illustration of another second jaw of anend-effector assembly in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 38 is a schematic illustration of still another second jaw of anend-effector assembly in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 39 is a perspective view of a surgical instrument configured todeploy rivets in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 40 is a perspective view of an end-effector of the surgicalinstrument of FIG. 39 cutting, sealing, and forming a rivet line intissue in accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 41 is an exploded perspective view of an end-effector of thesurgical instrument of FIG. 39 in accordance with one non-limitingembodiment of the present disclosure;

FIG. 42 is a perspective view of a rivet cartridge configured for usewith an end-effector in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 43 is a cross-sectional view of the rivet cartridge taken alongline 43-43 of FIG. 42 in accordance with one non-limiting embodiment ofthe present disclosure;

FIG. 44 is an elevation view of a rivet that can be deployed from anend-effector of the surgical instrument of FIG. 39 in accordance withone non-limiting embodiment of the present disclosure;

FIGS. 45 and 46 are cross-sectional views of an end-effector of thesurgical instrument of FIG. 39 with some rivets deployed into the tissuein accordance with one non-limiting embodiment of the presentdisclosure;

FIG. 47 is a partial view of a first face of a first portion of anend-effector in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 48 is a partial view of a second face of a second portion of anend-effector in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 49 is a partial view of a first face of a first portion of anend-effector in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 50 is a view of a piece of tissue after an end-effector having thefirst portion of FIG. 49 has deployed rivets into the tissue, created aseal in the tissue, and created a cut line in the tissue in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 51 is a partial view of a first face of a first portion of anend-effector in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 52 is a view of a piece of tissue after an end-effector having thefirst portion of FIG. 51 has deployed rivets into the tissue, created aseal in the tissue, and created a cut line in the tissue in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 53 is a partial view of a first face of a first portion of anend-effector in accordance with one non-limiting embodiment of thepresent disclosure;

FIG. 54 is a view of a piece of tissue after an end-effector having thefirst portion of FIG. 53 has deployed rivets into the tissue, created aseal in the tissue, and created a cut line in the tissue in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 55A is an elevation view of a rivet in an undeformed, unmelted,and/or undeployed state in accordance with one non-limiting embodimentof the present disclosure;

FIG. 55B is a perspective view of the rivet of FIG. 55A in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 55C is an elevation view of the rivet of FIGS. 55A and 55B in amelted, deformed, and/or deployed state in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 56A is an elevation view of a rivet in an undeformed, unmelted,and/or undeployed state in accordance with one non-limiting embodimentof the present disclosure;

FIG. 56B is a perspective view of the rivet of FIG. 56A in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 56C is an elevation view of the rivet of FIGS. 56A and 56B in amelted, deformed, and/or deployed state in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 57A is an elevation view of a rivet in an undeformed, unmelted,and/or undeployed state in accordance with one non-limiting embodimentof the present disclosure;

FIG. 57B is a perspective view of the rivet of FIG. 57A in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 57C is an elevation view of the rivet of FIGS. 57A and 57B in amelted, deformed, and/or deployed state in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 58A is an elevation view of a rivet in an undeformed, unmelted,and/or undeployed state in accordance with one non-limiting embodimentof the present disclosure;

FIG. 58B is a perspective view of the rivet of FIG. 58A in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 58C is an elevation view of the rivet of FIGS. 58A and 58B in amelted, deformed, and/or deployed state in accordance with onenon-limiting embodiment of the present disclosure;

FIG. 59A is an elevation view of a rivet in an undeformed, unmelted,and/or undeployed state in accordance with one non-limiting embodimentof the present disclosure;

FIG. 59B is a perspective view of the rivet of FIG. 59A in accordancewith one non-limiting embodiment of the present disclosure;

FIG. 59C is an elevation view of the rivet of FIGS. 59A and 59B in amelted, deformed, and/or deployed state in accordance with onenon-limiting embodiment of the present disclosure;

Corresponding reference characters indicate corresponding partsthroughout the several views. The example embodiments set out hereinillustrate various embodiments of the present disclosure, in one form,and such example embodiments are not to be construed as limiting thescope of the present disclosure in any manner.

DETAILED DESCRIPTION

Various embodiments are directed to apparatuses, systems, and methodsfor the treatment of tissue. Numerous specific details are set forth toprovide a thorough understanding of the overall structure, function,manufacture, and use of the embodiments as described in thespecification and illustrated in the accompanying drawings. It will beunderstood by those skilled in the art, however, that the embodimentsmay be practiced without such specific details. In other instances,well-known operations, components, and elements have not been describedin detail so as not to obscure the embodiments described in thespecification. Those of ordinary skill in the art will understand thatthe embodiments described and illustrated herein are non-limitingexamples, and thus it can be appreciated that the specific structuraland functional details disclosed herein may be representative andillustrative. Variations and changes thereto may be made withoutdeparting from the scope of the claims.

Reference throughout the specification to “various embodiments,” “someembodiments,” “one embodiment,” “certain embodiments,” or “anembodiment”, or the like, means that a particular feature, structure, orcharacteristic described in connection with the embodiment is includedin at least one embodiment. Thus, appearances of the phrases “in variousembodiments,” “in some embodiments,” “in one embodiment,” “in certainembodiments,” or “in an embodiment”, or the like, in places throughoutthe specification are not necessarily all referring to the sameembodiment. Furthermore, the particular features, structures, orcharacteristics may be combined in any suitable manner in one or moreembodiments. Thus, the particular features, structures, orcharacteristics illustrated or described in connection with oneembodiment may be combined, in whole or in part, with the featuresstructures, or characteristics of one or more other embodiments withoutlimitation.

The entire disclosures of the following non-provisional United Statespatents are hereby incorporated by reference herein:

-   U.S. Pat. No. 7,381,209 to Truckai et al., entitled ELECTROSURGICAL    INSTRUMENT, which issued on Jun. 3, 2008;-   U.S. Pat. No. 7,354,440 to Truckai et al., entitled ELECTROSURGICAL    INSTRUMENT AND METHOD OF USE, which issued on Apr. 8, 2008;-   U.S. Pat. No. 7,311,709 to Truckai et al., entitled ELECTROSURGICAL    INSTRUMENT AND METHOD OF USE, which issued on Dec. 25, 2007;-   U.S. Pat. No. 7,309,849 to Truckai et al., entitled POLYMER    COMPOSITIONS EXHIBITING A PTC PROPERTY AND METHODS OF FABRICATION,    which issued on Dec. 18, 2007;-   U.S. Pat. No. 7,220,951 to Truckai et al., entitled SURGICAL SEALING    SURFACES AND METHODS OF USE, which issued on May 22, 2007;-   U.S. Pat. No. 7,189,233 to Truckai et al., entitled ELECTROSURGICAL    INSTRUMENT, which issued on Mar. 13, 2007;-   U.S. Pat. No. 7,186,253 to Truckai et al., entitled ELECTROSURGICAL    JAW STRUCTURE FOR CONTROLLED ENERGY DELIVERY, which issued on Mar.    6, 2007;-   U.S. Pat. No. 7,169,146 to Truckai et al., entitled ELECTROSURGICAL    PROBE AND METHOD OF USE, which issued on Jan. 30, 2007;-   U.S. Pat. No. 7,125,409 to Truckai et al., entitled ELECTROSURGICAL    WORKING END FOR CONTROLLED ENERGY DELIVERY, which issued on Oct. 24,    2006; and-   U.S. Pat. No. 7,112,201 to Truckai et al., entitled ELECTROSURGICAL    INSTRUMENT AND METHOD OF USE, which issued on Sep. 26, 2006.

Various embodiments of apparatuses, systems, and methods of the presentdisclosure relate to creating thermal “welds,” “seals,” and/or “fusion”within native tissue volumes. These terms may be used interchangeablyherein to describe thermal treatments of a targeted tissue volume thatresult in a substantially uniform fused-together tissue mass, forexample, in welding blood vessels that exhibit substantial burststrength immediately post-treatment. The strength of such welds isparticularly useful for (i) permanently sealing blood vessels in vesseltransection procedures; (ii) welding organ margins in resectionprocedures; (iii) welding other anatomic ducts wherein permanent closureis required; and also (iv) for performing vessel anastomosis, vesselclosure or other procedures that join together anatomic structures orportions thereof. The sealing, welding, or fusion of tissue as disclosedherein is to be distinguished from “coagulation”, “hemostasis” and othersimilar descriptive terms that generally relate to the collapse andocclusion of blood flow within small blood vessels or vascularizedtissue. For example, any surface application of thermal energy can causecoagulation or hemostasis—but does not fall into the category of“sealing” as the term is used herein. Such surface coagulation may notcreate a seal that provides any substantial strength in the treatedtissue.

At the molecular level, the phenomena of truly “sealing” tissue asdisclosed herein may result from the thermally-induced denaturation ofcollagen and other protein molecules in a targeted tissue volume tocreate a transient liquid or gel-like proteinaceous amalgam. A selectedenergy density can be provided in the targeted tissue to causehydrothermal breakdown of intra- and intermolecular hydrogen crosslinksin collagen and other proteins. The denatured amalgam can be maintainedat a selected level of hydration—without desiccation—for a selected timeinterval which can be very brief. The targeted tissue volume can bemaintained under a selected very high level of mechanical compression toinsure that the unwound strands of the denatured proteins are in closeproximity to allow their intertwining and entanglement. Upon thermalrelaxation, the intermixed amalgam results in protein entanglement asre-crosslinking or renaturation occurs to thereby cause a uniformfused-together mass.

Various embodiments disclosed herein provide electrosurgical jawstructures or portions adapted for transecting captured tissue betweenthe jaws or portions and for contemporaneously sealing the capturedtissue margins with controlled application of RF energy or other energy.The jaw structures can comprise a scoring or cutting element which cancut or score tissue independently of the tissue capturing and sealingfunctions of the jaw structures or portions. The jaw structures orportions can comprise first and second opposing jaws that carry fuses,such as positive temperature coefficient materials, for example, formodulating RF energy or other energy delivery to the engaged tissue.

The embodiments of the devices described herein may be introduced insidea patient using minimally invasive or open surgical techniques. In someinstances, it may be advantageous to introduce the devices inside thepatient using a combination of minimally invasive and open surgicaltechniques. Minimally invasive techniques may provide more accurate andeffective access to the treatment region for diagnostic and treatmentprocedures. To reach internal treatment regions within the patient, thedevices described herein may be inserted through natural openings of thebody such as the mouth, anus, and/or vagina, for example. In somecircumstances, the devices can then access various tissue treatmentregions translumenally. In other instances, the devices may not accessthe various tissue treatment regions translumenally. In any event, suchprocedures can be combined with laparoscopic, percutaneous, and/or openapproaches. Minimally invasive procedures performed by the introductionof various medical devices into the patient through a natural opening ofthe patient are known in the art as NOTES™ procedures. Some portions ofthe devices may be introduced to the tissue treatment regionpercutaneously or through small—keyhole—incisions. Laparoscopicapproaches can comprise Single Site Laparoscopy (SSL), which can involvea single trocar usually placed in the umbilicus containing multipleports. SSL can also include the placement of multiple trocars in asingle location to minimize scarring. In one embodiment, these SSLapproaches may be combined with most NOTES™ procedures, natural orificeprocedures, and/or percutaneous procedures, for example. SSL can also bereferred to as Single Incision Laparocopic Surgery (SILS™) and SinglePort Access (SPA). Robotic surgical approaches can also be used with theembodiments of the present disclosure.

Endoscopic minimally invasive surgical and diagnostic medical procedurescan be used to evaluate and treat internal organs by inserting a smalltube into the body. The endoscope may have a rigid or a flexible tube. Aflexible endoscope may be introduced either through a natural bodyopening (e.g., mouth, anus, and/or vagina) or via a trocar through arelatively small—keyhole—incision incisions (usually 0.5-1.5 cm). Theendoscope can be used to observe surface conditions of internal organs,including abnormal or diseased tissue such as lesions and other surfaceconditions and capture images for visual inspection and photography. Theendoscope may be adapted and configured with working channels forintroducing medical instruments to the treatment region for takingbiopsies, retrieving foreign objects, and/or performing surgicalprocedures.

Certain example embodiments will now be described to provide an overallunderstanding of the principles of the structure, function, manufacture,and use of the devices and methods disclosed herein. One or moreexamples of these embodiments are illustrated in the accompanyingdrawings. Those of ordinary skill in the art will understand that thedevices and methods specifically described herein and illustrated in theaccompanying drawings are non-limiting example embodiments and that thescope of the various embodiments of the present disclosure is definedsolely by the claims. The features illustrated or described inconnection with one example embodiment may be combined with the featuresof other embodiments. Such modifications and variations are intended tobe included within the scope of the present disclosure.

In various embodiments, surgical instruments, such as circular staplers,for example, have been developed for use in a surgical procedure knownas an anastomosis. Circular staplers useful for performing ananastomosis are disclosed, for example, in U.S. Pat. No. 5,104,025 toMain et al. entitled INTRALUMINAL ANASTOMOTIC SURGICAL STAPLER WITHDETACHED ANVIL, which was issued on Apr. 14, 1992, U.S. Pat. No.5,205,459 to Brinkerhoff et al., entitled SURGICAL ANASTOMOSIS STAPLINGINSTRUMENT, which was issued on Apr. 27, 1993, U.S. Pat. No. 5,285,945to Brinkerhoff et al., entitled SURGICAL ANASTOMOSIS STAPLINGINSTRUMENT, which was issued on Feb. 15, 1994, and U.S. Pat. No.5,309,927 to Welch, entitled CIRCULAR STAPLER TISSUE RETENTION SPRINGMETHOD, which was issued on May 10, 1994, and in U.S. patent applicationSer. No. 12/408,905 to Measamer et al., entitled CIRCULAR SURGICALSTAPLING INSTRUMENT WITH ANVIL LOCKING SYSTEM, filed on Mar. 23, 2009,which are each herein incorporated by reference in their respectiveentireties.

One form of an anastomosis comprises a surgical procedure where twotubular sections of intestine are joined together after a diseasedportion of the intestine has been excised. The procedure usuallyrequires re-joining ends of the two tubular sections together to form acontinuous tubular pathway. Previously, this surgical procedure was alaborious and time consuming operation. In most instances, the surgeonhad to precisely cut and align the ends of the two tubular sections ofintestine and maintain the alignment while joining the ends withnumerous suture stitches. The development of surgical instruments, suchas circular staplers, for example, has greatly simplified theanastomosis procedure and has also decreased the time required toperform an anastomosis.

In one embodiment, referring to FIGS. 1-5, a surgical instrument 10,such a surgical stapler, a circular tissue joining device, a circularsurgical stapler, and/or a surgical stapling assembly, for example, cancomprise an elongate shaft 12 comprising a proximal end 14 and a distalend 16. In various embodiments, the elongate shaft 12 can be rigid,while, in other embodiments, the elongate shaft 12 can be semi-rigid orflexible or can comprise semi-rigid or flexible portions. In oneembodiment, at least a portion of the surgical instrument 10 can beconfigured to be partially inserted through a natural orifice in apatient, such as the anus, mouth, and/or vagina, or through an incisionin a body wall using a trocar, for example. A handle portion 18 canextend from the proximal end 14 of the elongate shaft 12 and anend-effector 20 can extend from the distal end 16 of the elongate shaft12. The terms “proximal” and “distal” are used herein with reference tothe clinician or surgeon (hereafter “surgeon”) holding the handleportion 18 of the surgical instrument 10. For example, the end-effector20 is located distal from the surgeon while the handle portion 18 islocated proximal to the surgeon. In various embodiments, the handleportion 18 can comprise two portions which are assembled together toform the handle portion 18, for example. In one embodiment, the twoportions of the handle portion 18 can be snap-fit, press-fit, adhered,glued, and/or fastened to one another, for example.

In one embodiment, the handle portion 18 can comprise a trigger 22operably engaged with an actuation mechanism 24. The actuation mechanism24 can extend from the handle portion 18 to or proximate to a portion ofthe end-effector 20. In various embodiments, the actuation mechanism 24,or portions thereof, can be rigid, semi-rigid, or flexible. In anembodiment, where the actuation mechanism 24 is flexible, or comprisesflexible portions, the material can still be rigid enough to drive astaple driver 42 and/or a cutting member 40 distally within theend-effector 20. The trigger 22 can be moved toward the handle portion18 in the direction indicated generally by arrow 23 to cause theactuation mechanism 24 to move distally and fire or drive staplespositioned within a portion of the end-effector 20 distally into tissuecompressed within the end-effector 20, as described in further detailbelow. When the trigger 22 is moved toward the handle portion 18,thereby moving the actuation mechanism 24 distally, the cutting member40 can also be moved distally to incise tissue compressed within theend-effector 20, as described in further detail below. In oneembodiment, the actuation mechanism 24 or portions of the end-effector20 can be steerable, for example.

In one embodiment, referring again to FIGS. 1-5, the end-effector 20 cancomprise a first portion 26 and a second portion 28. The first portion26 can comprise an aperture 30 extending therethrough such that aportion of an actuation member 31 can extend into the aperture 30 (seee.g., FIG. 5). A portion of the actuation member 31 can extend throughthe actuation mechanism 24. The second portion 28 of the end-effector 20can comprise a projection 32 configured to extend at least partiallyinto the aperture 30 and be operably engaged with the actuation member31 via any suitable connection, such as an interlocking connection asillustrated in FIG. 5, for example. In one embodiment, a portion of theprojection 32 can slide over a distal portion of the actuation member 31and engage sidewalls or detents in the sidewalls of the actuation member31 to operably join the portion of the projection 32 and the actuationmember 31. In other various embodiments, a distal portion of anactuation member can slide over a portion of the projection and engagesidewalls or detents in the sidewalls of the projection to operably jointhe portion of the projection and the actuation member 31.

In one embodiment, when the projection 32 of the second portion 28 isoperably engaged with the actuation member 31, the second portion 28 canbe moved relative (e.g., distal/proximal movement) to the first portion26 using an adjustment knob 34 located on a proximal portion of thehandle portion 18, for example. The adjustment knob 34 can be operablyengaged with the actuation member 31 such that as the adjustment knob 34is moved or rotated, the actuation member 31 can move distally and/orproximally within the surgical instrument 10 (i.e., rotational motion ofthe adjustment knob 34 is converted into linear motion of the actuationmember 31). In one embodiment, referring to FIG. 5, by turning theadjustment knob 34, the length of the adjustment member 31 extendinginto the aperture 30 in the first portion 26 can be adjusted. Statedanother way, rotation of the adjustment knob 34 about its longitudinalaxis can move the second portion 28 relative to the first portion 26owing to the engagement of the portion of the projection 32 of thesecond portion 28 with the distal portion of the actuation member 31.For example, if the adjustment knob 34 is rotated in the clockwisedirection, the length of the actuation member 31 within the aperture 30can be increased, while if the adjustment knob 34 is rotated in thecounter-clockwise direction, the length of the actuation member 31within the aperture 30 can be decreased. Such adjustment of the lengthof the actuation member 31 within the aperture 30 in turn can adjust thedistance that the second portion 28 is positioned from the first portion26 thereby allowing the end-effector 20 to clamp and release tissuepositioned intermediate the first portion 26 and the second portion 28.

In one embodiment, referring to FIG. 4, the actuation member 31 cancomprise a threaded rod 36 and an adjustment tube 37. A proximal end ofthe threaded rod 37 can be engaged with the actuation knob 34, such thatrotation of the actuation knob 34 rotates the threaded rod 37. A distalend of the threaded rod 36 can be operably engaged with the adjustmenttube 37. The adjustment tube 37 can comprise threads on its innersurface, for example, such that the threaded rod 36 can be threadablyengaged with the adjustment tube 37 to move the adjustment tube 37distally and proximally when the threaded rod 36 is rotated. Statedanother way, the proximal end of the adjustment tube 37 can essentiallyride on the distal end or portion of threaded rod 36 in threadableengagement. In one embodiment, the adjustment tube 37 can be configuredand situated such that it does not rotate when the threaded rod 36 isrotated to allow distal/proximal movement of the adjustment tube 37.

In one embodiment, the adjustment knob 34 can be fixedly attached to theproximal end of the threaded rod 36 such that as the adjustment knob 34is rotated in the clockwise direction, for example, the threaded rod 36can also be rotated in the clockwise direction. Likewise, as theadjustment knob 34 is rotated in the counter-clockwise direction, thethreaded rod 36 can also be rotated in the counter-clockwise direction.In one embodiment, when the adjustment knob 34 is rotated in theclockwise direction, the adjustment tube 37 can be moved distally andwhen the adjustment knob 34 is rotated in the counter-clockwisedirection the adjustment tube 37 can be moved proximally. Such movementcan adjust the distance between the first portion 26 and the secondportion 28 when the portion of the projection 32 is engaged with thedistal end or portion of the adjustment tube 37. In various embodiments,the adjustment tube 37 can comprise a flexible, a semi-rigid, and/or arigid material, for example. In one embodiment, although notillustrated, an adjustment tube may extend fully through the aperture 30in the first portion 26 such that it can be engaged with the secondportion 28. In such an embodiment, the second portion 28 of theend-effector 20 may not comprise a projection.

In one embodiment, the adjustment knob 34 and the actuation member 31can be configured to move the second portion 28 to at least onepredetermined distance from the first portion 26 to cause tissuepositioned between the first portion 26 and the second portion 28 to becompressed or clamped. In various embodiments, the adjustment knob 34,during rotation, can encounter a stop (not illustrated) when thepredetermined distance or a minimum distance between the second portion28 and the first portion 26 is reached so as to not allow a surgeon toover compress tissue positioned intermediate the first portion 26 andthe second portion 28. In one embodiment, a tissue compression indicator27 can be provided on the surgical instrument 10. The tissue compressionindicator 27 can be operably or electronically linked to the adjustmentknob 34, the actuation member 31, or the end-effector 20 such that thetissue compression indicator 27 can provide the surgeon with visual,audible, or tactile feedback of the tissue compression or the distancebetween the first portion 26 or the second portion 28. In oneembodiment, the tissue compression indicator 27 can indicate to asurgeon the degree to which staple legs will be deformed, for example,based on the distance between the first portion 26 and the secondportion 28. Various embodiments of such tissue compression indicatorsare known to those of skill in the art. In one embodiment, the projectedtissue compression and projected staple leg deformation can be measuredby measuring the impedance of the tissue across the thickness of thetissue, for example.

In one embodiment, referring to FIGS. 1 and 4, the trigger 22 extendingfrom the handle portion 18, when moved in the direction indicatedgenerally by arrow 23, can cause the actuation mechanism 24 to movedistally within the elongate shaft 12 to drive the staple driver member42 distally and deploy staples 38 distally into tissue compressedintermediate the first portion 26 and the second portion 28 and/or drivethe cutting member 40 distally to incise the tissue. In one embodiment,the actuation mechanism 24, the staples 38, the staple driver member 42,and/or the cutting member 40 can each comprise an electricallyconductive portion or can be comprised of an electrically conductivematerial, such that energy can be transmitted to the staples 38 and/orthe cutting member 40, as discussed in further detail herein. In oneembodiment, a staple driver member and a cutting member can be formed ofthe same component. In various embodiments, the trigger 22 can bepivotably attached to the handle portion 18 such that as the proximalend of the trigger 22 is moved toward the handle portion 18, the distalend of the trigger 22 forces the actuation mechanism 24 distally withinthe elongate shaft 12 owing to an attachment between the distal portionof the trigger 22 and a proximal portion of actuation mechanism 24.

In one embodiment, the trigger 22 can be normally-biased away from thehandle portion 18 such that after the proximal portion of the trigger 22is pulled toward the handle portion 18 and the force applied by thesurgeon to the trigger 22 is released, the trigger 22 can again bebiased into the position shown in FIG. 1, for example. Such biasing cancause the actuation mechanism 24 to move proximally or remain proximallypositioned within the elongate shaft 12 owing to the attachment betweenthe distal portion of the trigger 22 and the proximal portion ofactuation mechanism 24. The biasing can be accomplished by any suitablebiasing member.

In one embodiment, referring to FIGS. 1-5, the first portion 26 cancomprise a first face 44 at least partially or fully surrounding theaperture 30. The first portion 26 can also optionally comprise one ormore staple cavities 46 defined in the first face 44. In one embodiment,the one or more staple cavities 46 can be formed in a staple cartridge49 and a top surface 50 of the staple cartridge 49 can form a portion ofthe first face 44 and/or can be positioned flush with a plane of thefirst face 44. If the staple cartridge 49 is provided, the first portion26 can define a receiving slot into which the staple cartridge 49 can beremovably positioned. A staple 38 can be removably positioned withineach staple cavity 46.

In various embodiments, the first portion 26 can also comprise thecutting member 40 and the staple driver member 42. The staple drivermember 42, upon a force applied to it by the actuation mechanism 24, candrive the cutting member 40 and the staples 38 distally into tissuepositioned intermediate the first portion 26 and the second portion 28.In one embodiment, the staple driver member 42 can be configured to movethe one or more staples 38 between a first stored position in which thestaples 38 are at least partially positioned within the staple cavities46 and a second position in which the staples 38 are at least partiallydeployed from the staple cavities 46 into the tissue positionedintermediate the first face 44 of the first portion 26 and a second faceof the second portion 28.

In one embodiment, the first portion 26 can also comprise a firstelectrode 54, such as an electrode comprising an arcuate or circularshape, for example, that can at least partially surround the aperture30. In one embodiment, the first electrode 54 can function as a positiveelectrode that provides energy to the end-effector 20. The firstelectrode 54 can be positioned one of on and proximate to the first face44, as discussed in further detail below. In various embodiments, thecutting member 40 and/or the staples 38 can also act as electrodes whendriven by the actuation mechanism 24, as described herein. In oneembodiment, the first portion 26 can comprise a fuse, such as a positivetemperature coefficient material, for example, and an insulator asdiscussed in further detail herein.

In one embodiment, still referring to FIGS. 1-5, the second portion 28can comprise a second face 56 that substantially opposes the first face44 when the projection 32 of the second portion 28 at least partiallyextends into the aperture 30 of the first portion 26 and is engaged withthe actuation member 31. The second portion 28 can function as an anvilhaving one or more anvil pockets 58 defined in the second face 56. Theanvil pockets 58 can receive portions of legs of the staples 38 afterthose legs extend through tissue to deform portions of those legs andform staples in any suitable manner. The second portion 28 can alsocomprise a second electrode 60 positioned one of on and proximate to thesecond face 56. In certain embodiments, the second electrode 60 cancomprise an electrically conductive portion of the second portion 28,such as a metal portion, for example. In one embodiment, the secondelectrode 60 can function as the return electrode, or negativeelectrode, in combination with the actuation member 31, for example. Insuch an embodiment, the actuation member 31 can comprise an electricallyconductive member or portion or can be attached to a conductive memberor portion, such as a wire, for example. In other various embodiments,the actuation member 31 can be comprised of an electrically conductivematerial, for example. In one embodiment, the second portion 28 cancomprise a fuse, such as a positive temperature coefficient material,for example, and an insulator as discussed in more detail herein.

In one embodiment, the fuse 62 can be positioned intermediate or atleast partially intermediate the first electrode 54 of the first portion26 and the second electrode 60 of the second portion 28. In otherembodiments, the fuse 62 can be positioned on, attached to, or form aportion of the first portion 26 and/or the second portion 28. In stillother embodiments, the fuse can be positioned on portions of the staples38 and/or within the anvil pockets 58, for example. In variousembodiments, the fuse 62 can function like a conventional fuse. In oneembodiment, the fuse 62 can selectively interrupt energy flowing fromthe first electrode 54 to the second electrode 60 to at least inhibitover sealing or over heating of the tissue during sealing of the tissuepositioned intermediate the first electrode 54 and the second electrode60. As will be recognized by those of skill in the art, heat isgenerated in tissue when energy, such as electrical current, forexample, flows from one electrode, such as the first electrode 54,through the tissue, to another electrode, such as the second electrode60. This heat is caused by the resistance that the tissue provides tothe energy flow between the two electrodes. In one embodiment, the fuse62 can be used to control the amount of heat generated, i.e., bylimiting or stopping the energy flow between the electrodes if thetemperature of the tissue exceeds a predetermined temperature, such as atemperature of 100 degrees C., for example.

In one embodiment, the fuse 62 can comprise a positive temperaturecoefficient material (hereafter “PTC material”), for example. As the PTCmaterial increases in temperature, the electrical impedance of the PTCmaterial can increase. Thus, the PTC material can become power limitingwhen the temperature of the PTC material rises above a desired leveland, thus, the impedance can rise above the desired level. In oneembodiment, if a PTC material is used, a constant voltage source can beused. The electrical characteristics of the heating thus can be sensedto indirectly sense tissue temperature. Examples of PTC materials andtheir functions are described in greater detail in U.S. Pat. No.5,624,452 to Yates, entitled HEMOSTATIC SURGICAL CUTTING OR STAPLINGINSTRUMENT, which was issued on Apr. 29, 1997 U.S. Pat. No. 6,929,644 toTruckai et al., entitled ELECTROSURGICAL JAW STRUCTURE FOR CONTROLLEDENERGY DELIVERY, which was issued on Aug. 16, 2005, U.S. Pat. No.6,770,072, to Truckai et al., entitled ELECTROSURGICAL JAW STRUCTURE FORCONTROLLED ENERGY DELIVERY, which was issued on Aug. 3, 2004, and U.S.Pat. No. 6,929,622 to Chian, entitled SAFETY SYRINGE CYLINDER, which wasissued on Aug. 16, 2005, the entire disclosures of which are herebyfully incorporated by reference.

In one embodiment, temperature measuring devices or sensors, such asthermocouples, RTD's (resistive thermal devices), thermistors, and othersuitable devices can be embedded at strategic locations within theend-effector 20 or other end-effectors or end-effector assemblies tosense the temperature of the tissue positioned within the end-effector20. As a result, the delivery of energy to at least one of theelectrodes can be controlled in response to feedback from these devices,for example.

In one embodiment, the surgical instrument 10 can be configured tosupply energy, such as electrical energy, RF energy, ultrasonic energy,and/or thermal energy, for example, to the tissue compressed between thefirst face 44 and the second face 56 using the first and secondelectrodes 54 and 60 to seal or otherwise energize the tissue. Asdiscussed above, the heat can be generated by the resistance to energyflow between the first and second electrodes 54 and 60 or otherelectrodes that the tissue creates. In various embodiments, the surgicalinstrument 10 can comprise an activation button 64 or a trigger on thehandle portion 18 configured to cause the energy to flow to the firstelectrode 54, for example, when depressed or retracted. The activationbutton 64 can essentially act as a switch that is closed when theactivation button 64 is depressed. The switch can remain closed until apredetermined time has lapsed to ensure adequate tissue sealing. In oneembodiment, the switch can be normally-open such that energy does notflow to the end-effector at undesirable times. In other embodiments, thetrigger 22 can activate the energy flow or can contact a switch when theproximal end of the trigger 22 is moved toward the handle portion 18 toallow the energy to flow to the first electrode 54 or another suitableelectrode.

In various embodiments, referring to FIG. 4, the handle portion 18 cancomprise one or more energy inputs, such as input or terminal 66, forexample, which can be operably coupled with an energy source 68, such asa voltage source, a direct current source, an RF, and/or an ultra-sonicsource, for example. Suitable energy sources are known in the art. Invarious embodiments, the energy source 68 can provide energy to thesurgical instrument 10 and at least to the first electrode 54, whereinthe magnitude, duration, wave form, and/or frequency, for example, ofthe energy can be sufficiently controlled or modulated, by a controller70, for example, to provide a desired amount of energy to the surgicalinstrument 10 and/or the end-effector 20 of the surgical instrument 10.In various embodiments, the activation button 64 can be configured tooperably support a switch or a trigger, for example, which can beconfigured to electrically couple the energy source 68 with a firstelectrical conductor 70 of the surgical instrument 10 such that theenergy supplied to the input 66 can be transmitted to the end-effector20 and/or one of the electrodes.

In various embodiments, further to the above, the first electricalconductor 70 of the surgical instrument 10 can comprise a wire, such asinsulated wire, for example, which can extend between the input 66 andthe activation button 64 and extend between the activation button 64 andthe first electrode 54, for example. As discussed above, the activationbutton 64 can act as a switch to allow energy to pass through the firstelectrical conductor 70 from one side of the activation button 64 to theother side of the activation button 64 when the activation button 64 isdepressed or engaged. The energy can then be in electrical communicationwith the first electrode 54, for example, until the activation button 64is released or until a predetermined time has lapsed, such as after 2 to6 seconds, after 4 seconds, after 5 to 20 seconds, or after 10 to 15seconds, for example. In one embodiment, the first electrical conductor70 can comprise a conductive insert, comprised of copper or otherconductive material, for example, which can be at least partiallypositioned within an insulative jacket or sheath, for example. Incertain circumstances, the insulative jacket can be molded over thefirst electrical conductor 70 during an injection molding process, forexample.

In one embodiment, energy can be transmitted from the first electricalconductor 70 to the first electrode 54, pass through the tissuecompressed intermediate the first portion 26 and the second portion 28,and then flow to the second electrode 60. The second electrode 60 can bein electrical communication with a second electrical conductor 72. Inone embodiment, the second electrical conductor 72 can be formed withthe activation member 31, a portion of the activation member 31, or canbe an electrical conductor attached to, formed on, formed within, orpositioned within the activation member 31. As a result, the energy canpass from the second electrode 60 to a contact 59 on the projection 32or the actuation member 31 to the second electrical conductor 72 to anelectrical output or terminal 74 and back to the energy source 68. Thecontact 59 can be in electrical communication with the second electrode60. In other embodiments, a second electrical conductor can extend froma contact on the distal end or portion of the actuation member 31 to theelectrical output or terminal 74. The contact 59 can be in conductivecommunication with the second electrode 60 when the projection 32 isengaged with the actuation member 31 such that return energy can flow tothe output or terminal 74 and then back to the energy source 68 tocomplete the circuit of the energy source 68.

In various embodiments, insulative materials or non-conductive portionscan be suitably positioned within the end-effector 20 and/or thesurgical instrument, such that the energy can flow appropriately along apredetermined path through the end-effector 20 and/or the surgicalinstrument 10. Those of skill in the art will recognize the suitableplacement of the various insulative materials and non-conductiveportions within the end-effector 20 and/or the surgical instrument 10.

In one embodiment, referring to FIGS. 5 and 6, in the performance of asurgical anastomotic operation, two tubular pieces of lumen or tubulartissue A and B (e.g., intestinal tissue), can be attached together bythe staples 38, and/or by seals 76 created by the energy flowing throughthe first and second electrodes 54 and 60 or through other electrodes.In various embodiments, it may be desirable to use only the staples 38or to use only the seals 76 to attach the tubular tissue A to thetubular tissue B, depending on the wall thickness of the tubular tissueA and B compressed between the first face 44 and the second face 56. Inone embodiment, the two pieces of tubular tissue A and B may be attachedend-to-end or one piece of the tubular tissue may be attached laterallyaround an opening formed in the side of another piece of the tubulartissue. In performing the anastomosis with the surgical instrument 10,the two pieces of tubular tissue A and B can first be compressedtogether intermediate the first face 44 and the second face 56 byrotating the adjustment knob 34 in a clockwise direction, for example.The activation button 64 can then optionally be depressed to allowenergy to pass to the first electrode 54, through the fuse 62 or fuses,through the tissue, and to the second electrode 60. The staple drivermember 42 can then be driven distally by actuation of the trigger 22 todrive the staples 38 into the tissue and form the staples 38 using theanvil pockets 58 of the second portion 28 (i.e., by deforming a portionof the legs of the staples 38). At the same time, the cutting member 40can be driven distally by the same actuation of the trigger 22 to cutthe excess tissue positioned intermediate the first portion 26 and thesecond portion 28. In other embodiments, an additional trigger (notillustrated) can be provided such that one trigger drives the stapledriver member 42 distally and the other trigger drives the cuttingmember 40 distally, for example. As a result of the cutting member 40being driven distally, a donut-shaped section of tissue can be severedfrom each of the tubular pieces of tissue A and B by the cutting member40. The tubular tissue A and B joined by the staples 38 and/or the seal76 can be released from being compressed intermediate the first face 44and the second face 56 by rotating the adjustment knob 34 in thecounter-clockwise direction, for example, to thereby move the actuationmember 31 distally and move the second portion 28 away from the firstportion 26. The surgical instrument 10 can then be removed from thesurgical site by pulling the end-effector 20 through the circularopening between the pieces of tubular tissue A and B attached by thestaples 38 and/or the seal 76.

In one embodiment, the cutting member 40 and/or the staples 38 canfunction as an additional or a third electrode. In other embodiments,the cutting member 40 can function as a third electrode and the staples38 can function as a fourth electrode, or vice versa, for example. Insuch embodiments, the cutting member 40 and/or the staples 38 cancomprise a conductive material, such as a metal, for example, such thatthe energy from the energy source 68 can flow therethrough. In oneembodiment, the input or terminal 66 can be in electrical communicationwith an electrical conductor (not illustrated) formed with, formed on,positioned on, attached to, positioned within, or formed of theactuation mechanism 24. As a result, when the actuation mechanism 24 isbrought into contact with the staple driver member 42, the cuttingmember 40 and/or the staples 38 can be energized with the energy owingto the fact that the staple driver member 42, the cutting member 40,and/or the staples 38 can comprise electrically conductive portions orcan be comprised of electrically conductive materials, for example. Theenergy can flow through the staples 38 and/or the cutting member 40,through the tissue compressed between the first face 44 and the secondface 56, and to the second electrode 60 and exit the surgical instrument10 through the second electrical conductor 72, as discussed above. Theenergy can also flow through the fuse 62 or another suitable fuse. Inother embodiments, the energy can flow through the staples, through thetissue, and be returned to the energy source 68 using the cutting member40 or the second electrode 60 as a return electrode, for example. Here,again, the energy can also flow through the fuse 62 or another suitablefuse. In one embodiment, a separate electrical conductor (notillustrated) can be provided in communication with the cutting member 40to assist the cutting member 40 in acting as the return electrode forthe energy passing through the tissue from the staples 38. The separateelectrical conductor can be used to complete the circuit with the energysource 68. In one embodiment, by energizing the staples 38 and/or thecutting member 40, a seal can be created at the site of piercing and/orcutting of the tissue (i.e., where the staple legs pierce the tissueand/or where the cutting member 40 cuts the tissue), thereby reducingbleeding through the creation of a seal at the piercing and/or cuttingsite. In one embodiment, energy flowing through the staples 38 as theyare fired can tend to have its highest flux density at the tips of thestaples 38 owing to the tips being pointed (minimum surface area) andthe closest to the return electrode. In various embodiments, energyflowing through the cutting member 40 can also have its highest fluxdensity at the tip of the cutting member 40 owing to the tip having areduced surface area compared to the remainder of the cutting member 40.The above can result in enhanced mechanical sharpness and reduced forceto fire of the staples 38 and/or the cutting member.

In one embodiment, the activation button 64 can be used to allow energyto flow to the staples 38 and/or to the cutting member 40. Although notillustrated, a separate activation button can also be used to allowenergy to pass to the staples 38 and/or to the cutting member 40. Theseparate activation button can be configured and operate similar to theactivation button 64 described above. In other embodiments, otherconvention types of activation buttons or switches can be used with thesurgical instrument 10, for example.

In various embodiments, a separate energy source (not illustrated) canbe used to provide energy to the cutting member 40 and/or the staples 38for example. In such an embodiment, a circuit can be created through theuse of electrical conductors from the separate energy source, to thecutting member 40 and/or the staple driver member 42, and back to theseparate energy source. In one embodiment, the separate energy sourcecan be similar to or the same as the energy source 68 described aboveand can be controlled by a controller similar to or the same as thecontroller 70.

By providing energy to the cutting member 40 and/or the staples 38, aseal can be created where the cutting member 40 cuts the tissue and/orwhere legs of the staples 38 pierce the tissue. These seals at the pointof tissue cutting and/or piercing can reduce bleeding of the tissue. Inone embodiment, the seals formed where the cutting member 40 cuts thetissue and/or where the legs of the staples 38 pierce the tissue can beused to seal the tissue in place of the seal 76 formed by the first andsecond electrodes 54 and 60. In other embodiments, the seals formedwhere the cutting member 40 cuts the tissue and/or where the legs of thestaples 38 pierce the tissue can be used to seal the tissue as asupplementary seal to the seal 76 formed by the first and secondelectrodes 54 and 60.

In various configurations, by using more than two electrodes of theend-effector 20, the thermal spread of heat within the tissue compressedbetween the first face 44 and the second face 56 can be minimalizedthereby reducing heating of the tissue adjacent to the end-effector 20(i.e., tissue outside of the end-effector 20). Such minimalization canoccur owing to a controlled path of the energy through the variouselectrodes.

In the embodiments described below, like numerals (e.g., 26, 126, 126′,226 etc.) describe similar components, as those described above, unlessotherwise indicated. A full description of each like numbered componentbelow has been omitted for brevity.

In one embodiment, referring to FIG. 7 a, an end-effector 120 isdisclosed. The end-effector 120 can comprise a first portion 126 and asecond portion 128. The first portion 126 can comprise staple cavities146 that can be configured to each receive a staple 138, as explained ingreater detail above. In one embodiment, the first portion 126 can alsobe configured to receive a staple cartridge 149 that comprises thestaple cavities 146 and the staples 138 and fits at least partiallywithin a receiving slot in the first portion 126. The staples 138 can bedriven distally toward the second portion 128 by a staple driving member142, similar to that explained above. The first portion 126 can comprisea cutting member 140 configured to cut tissue, a first electrode 154,and an aperture 130. The second portion 128 can comprise a projection132 configured to be at least partially positioned within the aperture130, a second electrode 160, a fuse 162, such as PTC material, forexample, and anvil pockets 158. In FIG. 7 a, the second portion 128 isnot connected to the first portion 126 for clarity in illustration. Inone embodiment, the first electrode 154 can be positioned radiallyinwardly of the staple cavities 146 and radially outward from thecutting member 140 on the first portion 126. The anvil pockets 158 canbe aligned with the staple cavities 146 when the first portion 126 isengaged with the second portion 128 such that they can deform the staplelegs when the staples 138 are pushed distally. Similarly, the firstelectrode 154 can be aligned with the fuse 162 when the first portion126 is engaged with the second portion 128. As a result, a seal can beformed in tissue positioned intermediate the first portion 126 and thesecond portion 128 between a cutting line formed by the cutting member140 and a staple line formed by the staples 138. In various embodiments,portions of the first face 144, the second face 156, and/or otherportions of the end-effector 120 can comprise insulative materials “I”such that energy flows from the first electrode 154 through the fuse 162to the second electrode 160. If the insulative materials “I” are notprovided, the energy may flow in undesirable directions. In oneembodiment, insulative materials (not illustrated) can be providedaround the staple cavities 146 and/or around the anvil pockets 158, suchthat when tissue is compressed intermediate the staple cavities 146 andthe anvil pockets 158 and the end-effector 120 is energized, energy willnot be attracted to the staples 138 owing to the insulative barriercreated by the insulative materials.

In one embodiment, FIG. 7 b illustrates a cross-sectional view of theend-effector 120 of FIG. 7 a when the first portion 126 is engaged withthe second portion 128. In various embodiments, FIG. 7 b illustrates theenergy flow and the polarity of the first and second electrodes 154 (+)and 160 (−) and an example of where the insulative materials “I” areprovided in the end-effector 120.

In one embodiment, although not illustrated, a first electrode can bepositioned a depth within a first face of a first portion of anend-effector. A fuse, such as PTC material, for example, can bepositioned over the first electrode and be flush, or substantially flushwith a plane of the first face of the first portion. In such anembodiment, a portion of a second electrode may be positioned on asecond face of the second portion. In one embodiment, the secondelectrode can be positioned a depth within a second face of the secondportion of the end-effector. A fuse, such as PTC material, for example,can be positioned over the second electrode and be flush, orsubstantially flush with the plane of the second face of the secondportion. In other embodiments, the fuse may only be provided on thefirst portion or the second portion. The portions of the first face andthe second face not comprising the fuse can be comprised of aninsulative material, such that energy from the first electrode can bedirected through the fuse toward the second electrode and may beinhibited from bypassing the fuse to get to the second electrode. Asdiscussed herein, the fuse can limit or stop the energy flow from thefirst electrode to the second electrode, when appropriate, to maintainthe temperature of the tissue in the end-effector within a reasonablesealing temperature, such as 100 degrees C., for example.

In one embodiment, referring to FIG. 8 a, another end-effector 120′ isillustrated. The end-effector 120′ can comprise a first portion 126′ anda second portion 128′. In such an embodiment, the first portion 126′ cancomprise a first electrode 154′ positioned radially outward from staplecavities 146′. A cutting member 140′ can be positioned radially inwardfrom the staple cavities 146′. Correspondingly, a staple driver member142′ can be positioned radially inward as compared to that illustratedin the embodiment of FIG. 7 a. Also, in such an embodiment, a fuse 162′on the second portion 128′ can be positioned radially outward from theanvil pockets 158′. Similar to the embodiment of FIG. 7 a, anvil pockets158′ can be aligned with staple cavities 146′ when a projection 132′ ofthe second portion 128′ is at least partially positioned within anaperture 130′ in the first portion 126′ such that staple legs of staples138′ positioned within the staple cavities 146′ can be deformed by theanvil pockets 158′ when the staples 138′ are driven distally toward thesecond portion 128′. In various embodiments, portions of the first face144′, the second face 156′, and/or other portions of the end-effector120′ can comprise insulative materials such that energy flows from thefirst electrode 154′ through the fuse 162′ to the second electrode 160′.If the insulative materials are not provided, the energy may flow inundesirable directions. In one embodiment, insulative materials (notillustrated) can be provided around the staple cavities 146′ and/oraround the anvil pockets 158′, such that when tissue is compressedintermediate the staple cavities 146′ and the anvil pockets 158′ and theend-effector 120′ is energized, energy will not be attracted to thestaples 138′ owing to the insulative barrier created by the insulativematerials.

In one embodiment, FIG. 8 b is a cross-sectional view of theend-effector 120′ of FIG. 8 a when the first portion 126′ is attached tothe second portion 128′. In various embodiments, FIG. 8 b illustratesthe energy flow and the polarity of the first and second electrodes 154′(+) and 160′ (−) and an example of where the insulative materials “I”are provided in the end-effector 120′.

In one embodiment, referring to FIG. 9 a, an end-effector 220 isdisclosed which is similar to end-effector 120′ above, but that has tworows of staple cavities 246 defined in a first portion 226 and two rowsof anvil pockets 258 defined in a second portion 228. In such anembodiment, a staple driving member 242 can drive the two rows ofstaples 238 into the tissue compressed between the first portion 226 andthe second portion 228. The first portion 226 can comprise a firstelectrode 254 and an aperture 230 configured to at least partiallyreceive a projection 232 of the second portion 228. The first electrode254 can be positioned radially outward of the two rows of staples 254and radially outward of a cutting member 240. The cutting member 240 canbe positioned radially inward of the two rows of staple cavities 246.The second portion 228 can comprise a fuse 262. The fuse 262 can bepositioned radially outward of the two rows of the anvil pockets 258. Invarious embodiments, portions of the first face 244, the second face256, and/or other portions of the end-effector 220 can compriseinsulative materials “I” such that energy flows from the first electrode254, through the fuse 262, and to the second electrode 260. If theinsulative materials are not provided, the energy may flow inundesirable directions. In one embodiment, insulative materials (notillustrated) can be provided around the staple cavities 249 and/oraround the anvil pockets 258, such that when tissue is compressedintermediate the staple cavities 249 and the anvil pockets 258 and theend-effector 220 is energized, energy will not be attracted to thestaples 238 owing to the insulative barrier created by the insulativematerials.

In one embodiment, FIG. 9 b is a cross-sectional view of theend-effector 220 of FIG. 9 a when the first portion 226 is attached tothe second portion 228. In various embodiments, FIG. 9 b illustrates theenergy flow and the polarity of the first and second electrodes 254 (+)and 260 (−) and an example of where the insulative materials areprovided in the end-effector 220.

In one embodiment, referring to FIG. 10 a, an end-effector 220′comprising a first portion 226′ and a second portion 228′ is provided.The end-effector 220′ is the same as the end-effector 220 except that afirst portion 226′ of the end-effector 220′ has a first electrode 254′that is positioned radially inward of two rows of staples 238′ andexcept that the second portion 228′ has a fuse 262′ positioned radiallyinward of two rows of anvil pockets 258′. A cutting member 240′ of thefirst portion 226′ can be positioned radially inward of the firstelectrode 254′. A staple driving member 242′ on the first portion 226′can be positioned accordingly. In various embodiments, portions of thefirst face 244′, the second face 256′, and/or other portions of theend-effector 220′ can comprise insulative materials “I” such that energyflows from the first electrode 254′ through the fuse 262′ to the secondelectrode 260′. If the insulative materials “I” are not provided, theenergy may flow in undesirable directions. In one embodiment, insulativematerials (not illustrated) can be provided around the staple cavities249′ and/or around the anvil pockets 258′, such that when tissue iscompressed intermediate the staple cavities 249′ and the anvil pockets258′ and the end-effector 220′ is energized, energy will not beattracted to the staples 238′ owing to the insulative barrier created bythe insulative materials.

In one embodiment, FIG. 10 b is a cross-sectional view of theend-effector 220′ of FIG. 10 a when the first portion 226′ is attachedto the second portion 228′. In one embodiment, FIG. 10 b illustrates theenergy flow and the polarity of the first and second electrodes 254′ and260′ and an example of where the insulative materials are provided inthe end-effector 220′.

In one embodiment, referring to FIG. 11 a, an end-effector 320 comprisesa first portion 326 and a second portion 328. The first portion 326 cancomprise a first electrode 354, an aperture 330 configured to receive aprojection 332 of the second portion 328, and optionally a fuse 362,such as PTC material, for example. The first portion 326 can comprise acutting member 340 positioned radially inward of the first electrode354. The second portion 328 can comprise a second electrode 360 andoptionally a fuse (not illustrated), such as PTC material, for example.In such an embodiment, fewer or no staples may be required. Such anembodiment may be useful for sealing relatively thin tissue, such as intissue in the range of 0.25 mm to 1.0 mm or less than 1.0 mm, forexample. In various embodiments, portions of the first face 344, thesecond face 356, and/or other portions of the end-effector 320 cancomprise insulative materials such that energy flows from the firstelectrode 354, through the fuse 362, and to the second electrode 360.

In one embodiment, FIG. 11 b is a cross-sectional view of theend-effector 320 of FIG. 11 a when the first portion 326 is attached tothe second portion 328. In various embodiments, FIG. 11 b illustratesthe energy flow and the polarity of the first and second electrodes 354(+) and 360 (−).

In one embodiment, the surgical instruments disclosed herein can beoperated in at least two ways. In a first method of operation, thesecond portion of the end-effector can be engaged with the first portionof the end-effector inside separated pieces of tubular tissue, such asan intestine, for example, such that the actuation mechanism is operablyengaged with the second portion. Next, the actuation knob can be rotatedabout its longitudinal axis to compress the tissue positionedintermediate the first portion and the second portion. After the tissuehas been compressed to the surgeon's liking or to a suitablepredetermined thickness for adequate staple formation in the tissue orsealing of the tissue, possibly using a tissue compression indicator,such as tissue compression indicator 27, for example, the proximal endof the trigger can be moved or pulled toward the handle portion of thesurgical instrument to move the actuation mechanism distally within thesurgical instrument to fire the staples and move the cutting memberdistally and optionally to energize the first electrode. In otherembodiments, the first electrode can be energized when the activationbutton is depressed, for example. In various embodiments, energy canalso be supplied to the staples, such as the staples 38, and to thecutting member, such as the cutting member 40, as discussed above. Bycausing the actuation mechanism to move distally, the staples can befired into the tissue and formed against the second portion of theend-effector or the anvil pockets and the cutting member can be advanceddistally to excise the tissue. In one embodiment, the surgeon can hold,pull, or bias the proximal end of the trigger against the handle portionof the surgical instrument, or can hold the activation button in adepressed position, until an indicator informs the surgeon that thetissue has been adequately sealed. In various embodiments, the indicatorcan be a visual indicator, such as a light emitting diode, for example,or an audible indicator, such as a buzzer or an alarm, for example. Incertain embodiments, the time required to fully seal the tissue can bein the range of 2 to 6 seconds, 4 seconds, 2 to 15 seconds, or 3 to 10seconds, for example.

In one embodiment, further to the above, the surgical instrument cancomprise a trigger lockout (not illustrated) configured to maintain theproximal end of the trigger proximal to the handle portion (i.e., in theactuated position) until a suitable sealing time has lapsed. In such anembodiment, upon retraction of the proximal end of the trigger towardthe handle portion, a solenoid, for example, positioned proximate to thetrigger can be energized to drive a piston from the body of the solenoidand engage an aperture or detent in the trigger to maintain the triggerin the actuated position. The solenoid can be de-energized and thepiston can retract into the body of the solenoid after a predeterminedtissue sealing time has lapsed to allow the trigger to be biased backinto the position illustrated in FIG. 1, thereby ceasing the energy flowto the electrodes. In such an embodiment, energy can flow to theelectrodes when the trigger is held in the actuated position. In othervarious embodiments, the solenoid can be de-energized and the piston canretract into the body of the solenoid when the measured tissue impedanceexceeds a threshold value that indicates that the tissue is fullytreated and/or sealed. The solenoid can be activated or energized by aswitch, or other suitable activation technique, when the trigger isinitially moved toward the handle portion. Such a trigger lockout canprevent, or at least inhibit, the surgeon from releasing the trigger orallowing the trigger to be biased into the positioned illustrated inFIG. 1 prior to the seal being fully formed in the tissue compressedintermediate the first portion and the second portion. Such a featurecan prevent, or at least reduce, the chance that a weak or unsuitableseal is formed in the tissue. In other various embodiments, othersuitable trigger lockout devices can be used and are within the scope ofthe present disclosure. Such trigger lockout devices are within theskill of those of ordinary skill in the art.

In one embodiment, a similar solenoid can be operably engaged with aportion of the activation button. The solenoid can be activated orenergized when the activation button is depressed. While energized, thepiston of this solenoid can be extended to engage a portion of theactivation button to hold the activation button in the depressedposition and maintain energy flow to the electrodes for a predeterminedor suitable period of time. The solenoid can be de-energized and thepiston can then be retracted and withdrawn from contact with the portionof the activation button after the predetermined or suitable period oftime has passed to allow energy flow to the electrodes to cease.

In the second method of operation, the second portion of theend-effector can be engaged with the first portion of the end-effectorinside separate pieces of tubular tissue, such as an intestine, forexample, such that the actuation member is operably engaged with thesecond portion. Next, the actuation knob can be rotated about itslongitudinal axis to compress the tissue positioned intermediate thefirst portion and the second portion. After the tissue has beencompressed to the surgeon's liking or to a suitable predeterminedthickness for adequate staple formation in the tissue or sealing of thetissue, possibly using a tissue compression indicator, such as tissuecompression indicator 27, for example, the surgeon can depress theactivation button 64 or other suitable activation button to supplyenergy to the first electrode or to another electrode. In variousembodiments, energy can also be supplied to the staples, such as thestaples 38, and to the cutting member, such as cutting member 40, asdiscussed above. While energy is being supplied to the first electrode,the staples, and/or the cutting member, the trigger can be locked in thebiased position illustrated in FIG. 1, such that the proximal end of thetrigger cannot be moved toward the handle portion, to thereby preventfiring of the staples and distal movement of the cutting member, untilthe first electrode, the staples, and/or the cutting member have beenenergized for a period of time long enough to form a suitable seal inthe tissue. In one embodiment, the proximal end of the trigger can beprevented from moving toward the handle portion using a trigger lockout,similar to the trigger lockout comprising a solenoid described above,for example. After a predetermined sealing time has lapsed, the triggerlockout can release from the trigger (e.g., the piston of the solenoidis retracted into a body of the solenoid) thereby allowing the proximalend of the trigger to be moved toward the handle portion to fire thestaples and move the cutting member distally. Other methods of operationwill be recognized as part of the present disclosure by those of skillin the art.

In one embodiment, referring to FIG. 12, a staple cartridge 449comprising an electrode 454 is disclosed. The staple cartridge 449 cancomprise a face 444 and a tissue-contacting surface having staplecavities 446 defined therein. The staple cavities 446 can each comprisea staple 438 comprising one or more staple legs. The staple cartridge449 can be configured to be positioned within a receiving slot in afirst portion of a surgical instrument, such as the first portion 26 ofthe surgical instrument 10 described above. The staples 438 can then bedriven from the staple cartridge 444 distally into tissue using a stapledriver member, such as the staple driver member 42 of the surgicalinstrument 10 described above. In one embodiment, the staple drivermember 42 can be comprised of a PTC material or the staple contactingsurface of the staple driver member 42 can be comprised of a PTCmaterial. In one embodiment, the electrode 454 can be positionedradially inward of the staple cavities 446, for example. The electrode454 can be engaged with an electrical conductor such that energy canflow to the electrode at an appropriate time. Although one embodiment ofthe staple cartridge 449 is illustrated in FIG. 12, those of skill inthe art will recognize that other configurations of staple cartridgesare within the scope of the present disclosure. For example, a staplecartridge could have two rows of staple pockets and/or one or moreelectrodes. In various embodiments, the staple pockets can be positionedradially inward or radially outward of the electrodes, for example.

Although multiple example embodiments of the first portion and thesecond portion of the end-effector of the present disclosure arediscussed herein, those of skill in the art will recognize that variousother configurations are also within the scope of the presentdisclosure. For example, a first portion of an end-effector can havethree sets of staple cavities positioned radially inward or radiallyoutward of an electrode, while the second portion can have acorresponding electrode and/or fuse positioning and anvil pocketpositioning. In certain other embodiments, one or more rows of staplecavities can be positioned radially outward from an electrode and one ormore rows of staple cavities can be positioned radially inward from theelectrode in a first portion of an end-effector. In such an embodiment,a second portion of the end-effector can have corresponding anvil pocketpositioning and electrode and/or fuse positioning. In such anembodiment, a staple line can be formed in tissue compressed within theend-effector intermediate one or more rows of staples. Other variousembodiments and configurations of the electrodes, the fuse, the staplecavities, and the anvil pockets are envisioned and are within the scopeof the present disclosure. It will be understood that the exampleembodiments presented herein are not intended to limit the scope of theappended claims.

Although the surgical instrument 10 is illustrated and described with afirst portion 26 that functions as the staple deploying portion and asecond portion 28 that functions as an anvil for deforming the staples,the first portion can function as the anvil and the second portion canfunction as the staple deploying portion and/or staple cartridge. Insuch an embodiment, the staples can be positioned within a receivingslot, a staple cartridge, or staple cavities in the second portion andanvil pockets can be positioned within the first portion. A cuttingmember can also be engaged with the second portion. The electrodeconfiguration can be similar to that discussed above. In such anembodiment, the second portion can be pulled toward the first portion todeploy the staples proximally against the first portion and to move thecutting member proximally toward the first portion.

In one embodiment, the end effector 20 can comprise a tissue thicknessindicator (not illustrated) configured to sense a thickness of thetissue positioned intermediate the first face 44 and the second face 56.In various embodiments, the tissue thickness indicator can be positionedon the first face 44, the second face 56, or the first face 44 and thesecond face 56, for example. In other embodiments, the tissue thicknessindicator can be positioned at other suitable locations on theend-effector 20. Suitable tissue thickness indicators will be apparentto those of skill in the art, such as proximity sensors, for example. Inone embodiment, the projected tissue compression and projected stapleleg deformation can be measured by measuring the impedance of the tissueacross the thickness of the tissue, for example. The tissue thicknessindicator can be in electrical communication with a processor, such as amicroprocessor, for example, which can interpret the signal generated bythe tissue thickness indicator and instruct a suitable elementaccordingly. In one embodiment, the staple driver member 42 can beactivated separate from the cutting member 40. In such an embodiment,the staple driver member 42 may only be activated when a sensed tissuethickness is greater than a predetermined tissue thickness threshold.Tissue thicknesses above the predetermined tissue thickness thresholdmay benefit from staples being deployed into the tissue, while tissuethicknesses below the predetermined tissue thickness threshold may notrequire staples to be deployed into the tissue. In such an embodiment,only the cutting member 40 and the various electrodes (and not thestaple driver member 42) may be activated to create a seal in the tissueowing to the relatively thin nature of the tissue clamped within theend-effector 20. In various circumstances, relatively thin tissue maynot require that staples be deployed to effect a suitable seal in thetissue.

In one embodiment, a staple sensor (not illustrated) can be configuredto sense when the staple 38 is in the first stored position or at leastpartially in the first stored position. The staple sensor 38 can also bein electrical communication with the processor described above, oranother suitable processor, to interpret a signal received from thestaple sensor. When the processor receives an indication from the staplesensor 38 that indicates a staple is not in the first stored positionand the tissue thickness is above a predetermined tissue thicknessthreshold, the processor can activate a lockout device configured toselectively restrict movement of the cutting member 40 and/or the stapledriver member 42 relative to the first face 44. In one embodiment, thelockout device can be a solenoid in electrical communication with theprocessor, for example. When the lockout device is activated by theprocessor, it can engage the cutting member 40 and/or the staple drivermember 42 and restrict their movement relative to the first face 44,thereby preventing, or at least inhibiting, the cutting member 40 and/orthe staple driver member 42 from cutting and deploying staples into thetissue clamped within the end-effector 20 at least until a staple issensed by the staple sensor. In other embodiments, the lockout devicecan essentially function as a switch and can interrupt energy flow tothe various electrodes, for example. In other various embodiments, thesurgical instruments of the present disclosure can comprise othersuitable sensors, lockout devices, and/or electronic controls as will berecognized by those of ordinary skill in the art.

In one embodiment, FIGS. 13 and 14 illustrate a surgical stapling,sealing, and/or severing instrument 510. The surgical stapling andsevering instrument 510 can comprise an end-effector and/or anend-effector assembly 512 configured to be attached to or formed withthe surgical instrument 510. The end-effector assembly 512 can comprisean E-beam firing mechanism (“firing bar”) 514 or other suitable firingmechanism that can control the spacing of the end-effector assembly 512.In particular, an elongate channel or second jaw 516 (hereafter theterms “elongate channel” and “second jaw” can be used interchangeably)and a pivotally translatable anvil or first jaw 518 (hereinafter theterms “pivotally translatable anvil,” “anvil” and “first jaw” can beused interchangeably) can be maintained at a spacing that can assureeffective stapling and severing of tissue. In various embodiments, atleast one of the first jaw 518 and the second jaw 516 can be movablerelative to the other, both of the first jaw 518 and the second jaw 516can be movable, and/or the second jaw 516 can be movable relative to thefirst jaw 518, for example.

In various embodiments, the surgical instrument 510 can comprise ahandle portion 520 connected to an implement portion 522. The implementportion 522 can comprise a shaft 523 distally terminating in theend-effector assembly 512 or attached to the end-effector assembly 512.The handle portion 520 can comprise a pistol grip 524 toward which aclosure trigger 526 can be pivotally drawn by the surgeon to causeclamping and/or closing of the first jaw 518 toward the second jaw 516of the end-effector assembly 512. A firing trigger 528 can be positionedfarther outboard of the closure trigger 526 and can be pivotally drawnby the surgeon to cause the stapling, sealing, and/or severing of tissueclamped within the end-effector assembly 512.

In one embodiment, the closure trigger 526 can first be actuated by thesurgeon. Once the surgeon is satisfied with the positioning of theend-effector assembly 512 about the tissue, the surgeon can draw backthe closure trigger 526 to its fully closed, locked position proximateto the pistol grip 524. Then, the firing trigger 528 can be actuated bythe surgeon. The firing trigger 528 can springedly return to its unfiredstate when the surgeon removes pressure therefrom. A release button 530,when depressed, on the proximal end of the handle portion 520 canrelease the locked closure trigger 526 and allow it to return to itsunretracted position.

In various embodiments, a closure sleeve 532 can enclose a frame 534,which in turn can enclose a firing drive member 536 that can bepositioned by the firing trigger 528. The frame 534 can connect thehandle portion 520 to the end-effector assembly 512. With the closuresleeve 532 withdrawn proximally by the closure trigger 526, the firstjaw 518 can springedly open, pivoting away from the second jaw 516 andtranslating proximally with the closure sleeve 532. The second jaw 516can be configured to receive a staple cartridge 537 comprising at leastone staple.

In one embodiment, referring to FIGS. 14-16, the firing bar 514 cancomprise three vertically spaced pins that can control the spacing ofthe end-effector assembly 512 during firing. In particular, an upper pin538 can be staged to enter an anvil pocket 540 near the pivot betweenthe first jaw 518 and the second jaw 516. When fired with the first jaw518 closed, the upper pin 538 can advance distally within a longitudinalanvil slot 542 extending distally through the first jaw 518. Any minorupward deflection in the first jaw 518 can be overcome by a downwardforce imparted by the upper pin 538. In various embodiments, the firingbar 514 can comprise a lowermost pin, or firing bar cap, 544 that canupwardly engage a channel slot 545 in the second jaw 516, therebycooperating with the upper pin 538 to draw the first jaw 518 and thesecond jaw 516 slightly closer together in the event that excess tissueis clamped therebetween.

In one embodiment, the firing bar 514 can comprise a middle pin 546 thatcan pass through a firing drive slot 547 formed in a lower surface ofthe cartridge 537 and an upward surface of the second jaw 516, therebydriving the staples from within the cartridge 537 as described below.The middle pin 546, by sliding against the second jaw 516, can resistany tendency for the end-effector assembly 512 to be pinched shut at itsdistal end. To illustrate an advantage of the middle pin 546, FIG. 17illustrates an alternative end-effector assembly 512′ that lacks amiddle pin on a firing bar 514′. In this illustration, the end-effectorassembly 512′ can pinch shut at its distal end, which can tend to impairdesired staple formation.

In various embodiments, again referring to FIGS. 14-16, a distallypresented cutting member 548 between the upper and middle pins 538 and546 on the firing bar 514 can traverse through a proximally presented,vertical slot 549 in the cartridge 537 to sever tissue clamped withinthe end-effector assembly 512. The affirmative positioning of the firingbar 514 with regard to the second jaw 516 and the first jaw 518 canassure that an effective cut of the tissue is performed.

In one embodiment, the affirmative vertical spacing provided by theE-Beam firing bar 514 can be suitable for the limited size available forendoscopic devices. Moreover, the E-Beam firing bar 514 can enablefabrication of the first jaw 518 with a camber imparting a verticaldeflection at its distal end, similar to the position illustrated inFIG. 17. The cambered first jaw 518 can assist in achieving the desiredgap in the end-effector assembly 512 even with the anvil's reducedthickness, which is thus more suited to the size limitations of anendoscopic device.

In various embodiments, the E-Beam firing bar 514 can enable increasedapplications, especially in combination with a range of configurationsof staple cartridges. For instance, a surgeon may select a gray staplecartridge yielding a 0.02 mm tissue gap, a white staple cartridgeyielding a 0.04 mm tissue gap, a blue staple cartridge yielding a 0.06mm tissue gap, and/or a green staple cartridge yielding a 0.10 mm tissuegap. The vertical height of each respective staple cartridge incombination with the length of staples and an integral wedge sled(described in more detail below) can predetermine this desired tissuethickness with the first jaw 518 appropriately vertically spaced by theE-Beam firing bar 514.

In various embodiments, referring to FIGS. 18-21, the handle portion 520can be comprised of first and second base sections 550 and 552, whichcan be molded from a polymeric material, such as a glass-filledpolycarbonate, for example. In one embodiment, the first base section550 can comprise a plurality of cylindrical-shaped pins 554, while thesecond base section 552 can comprise a plurality of extending members556, each comprising a hexagonal-shaped opening 558 or otherwise shapedopening. The cylindrical-shaped pins 554 can be received within thehexagonal-shaped openings 558 and can be frictionally held therein orotherwise held therein for maintaining the first and second basesections 550 and 552 in assembly.

In one embodiment, a rotating knob 560 can comprise a bore 562 extendingcompletely therethrough for engaging and rotating the implement portion522 about its longitudinal axis. The rotating knob 560 can comprise aninwardly protruding boss 564 extending along at least a portion of thebore 562. The protruding boss 564 can be received within a longitudinalslot 566 formed at a proximal portion of the closure sleeve 532 suchthat rotation of the rotating knob 560 can effect rotation of theclosure sleeve 532. It will be appreciated that the boss 564 can extendthrough the frame 534 and into contact with a portion of the firingdrive member 536 to effect their rotation as well. Thus, theend-effector assembly 512 (not illustrated in FIGS. 18-21) can rotatewith the rotating knob 560.

In one embodiment, a proximal end 568 of the frame 534 can passproximally through the rotating knob 560 and can comprise acircumferential notch 570 that can be engaged by opposing channelsecurement members 572 extending respectively from the base sections 550and 552. Only the channel securement member 572 of the second basesection 552 is illustrated. The channel securement members 572 extendingfrom the first and second base sections 550 and 552 can serve to securethe frame 534 to the handle portion 520 such that the frame 534 does notmove longitudinally relative to the handle portion 520.

In various embodiments, the closure trigger 526 can comprise a handlesection 574, a gear segment section 576, and an intermediate section578. A bore 580 can extend through the intermediate section 578. Acylindrical support member 582 extending from the second base section552 can pass through the bore 580 for pivotably mounting the closuretrigger 526 on the handle portion 520. A second cylindrical supportmember 583 extending from the second base section 552 can pass through abore 581 of the firing trigger 528 for pivotally mounting on the handleportion 520. A hexagonal opening 584 can be provided in the cylindricalsupport member 583 for receiving a securement pin (not illustrated)extending from the first base section 550.

In one embodiment, a closure yoke 586 can be housed within the handleportion 520 for reciprocating movement therein and can serve to transfermotion from the closure trigger 526 to the closure sleeve 532. Supportmembers 588 extending from the second base section 552 and a securementmember 572, which extends through a recess 589 in the yoke 586, cansupport the yoke 586 within the handle portion 520.

In various embodiments, a proximal end 590 of the closure sleeve 532 cancomprise a flange 592 that can be snap-fitted or otherwise fitted into areceiving recess 594 formed in a distal end 596 of the yoke 586. Aproximal end 598 of the yoke 586 can comprise a gear rack 600 that canbe engaged by the gear segment section 576 of the closure trigger 526.When the closure trigger 526 is moved toward the pistol grip 524 of thehandle portion 520, the yoke 586 and, hence, the closure sleeve 532 canmove distally, compressing a spring 602 that biases the yoke 586proximally. Distal movement of the closure sleeve 532 can effect pivotaltranslational movement of the first jaw 518 distally and toward thesecond jaw 516 of the end-effector assembly 512 and proximal movementcan effect closing, as discussed below.

In various embodiments, the closure trigger 526 can be forward biased toan open position by a front surface 630 interacting with an engagingsurface 628 of the firing trigger 628. Clamp first hook 604 that canpivot top to rear in the handle portion 520 about a pin 606 can restrainmovement of the firing trigger 528 toward the pistol grip 524 until theclosure trigger 526 is clamped to its closed position. The first hook604 can restrain the firing trigger 528 motion by engaging a lockout pin607 in the firing trigger 528. The hook 604 can also be in contact withthe closure trigger 526. In particular, a forward projection 608 of thehook 604 can engage a member 610 on the intermediate section 578 of theclosure trigger 526, the member 610 being positioned outward of the bore580 toward the handle section 574. The hook 604 can be biased towardcontact with the member 610 of the closure trigger 526 and can beengaged with a lockout pin 607 in the firing trigger 528 by a releasespring 612. As the closure trigger 526 is depressed, the hook 604 can bemoved top to rear, compressing the release spring 612 that is capturedbetween a rearward projection 614 on the hook 604 and a forwardprojection 616 on the release button 530.

In one embodiment, as the yoke 586 moves distally in response toproximal movement of the closure trigger 526, an upper latch arm 618 ofthe release button 530 can move along an upper surface 620 on the yoke586 until dropping into an upwardly presented recess 622 in a proximal,lower portion of the yoke 586. The release spring 612 can urge therelease button 530 outward, which can pivot the upper latch arm 618downwardly into engagement with the upwardly presented recess 622,thereby locking the closure trigger 556 in a tissue clamping position,such as illustrated in FIG. 20, for example.

In various embodiments, the latch arm 618 can be moved out of the recess622 to release the first jaw 518 by pushing the release button 530inward. Specifically, the upper latch arm 618 can pivot upward about apin 623 of the second base section 552. The yoke 586 can then bepermitted to move proximally in response to return movement of theclosure trigger 526.

In one embodiment, a firing trigger return spring 624 can be locatedwithin the handle portion 520 with one end attached to the pin 606 ofthe second base section 552 and the other end attached to a pin 626 onthe firing trigger 528. The firing return spring 624 can apply a returnforce to the pin 626 for biasing the firing trigger 528 in a directionaway from the pistol grip 524 of the handle portion 520. The closuretrigger 526 can also be biased away from pistol grip 524 by the engagingsurface 628 of the firing trigger 528 biasing the front surface 630 ofthe closure trigger 526.

In various embodiments, as the closure trigger 526 is moved toward thepistol grip 524, its front surface 630 can be engaged with the engagingsurface 628 on the firing trigger 528 causing the firing trigger 528 tomove to its “firing” position. When in its firing position, the firingtrigger 528 can be located at an angle of approximately 45 degrees, forexample, to the pistol grip 524. After staple firing, the spring 624 cancause the firing trigger 528 to return to its initial unfired position.During the return movement of the firing trigger 528, its engagingsurface 628 can push against the front surface 630 of the closuretrigger 526 causing the closure trigger 526 to return to its initialposition. A stop member 632 can extend from the second base section 552to prevent the closure trigger 526 from rotating beyond its initialposition.

In various embodiments, the surgical stapling, sealing, and/or severinginstrument 510 additionally can comprise a reciprocating section 634, amultiplier 636, and a drive member 638. The reciprocating section 634can comprise a wedge sled in the implement portion 522 (not illustratedin FIGS. 18-21) and a metal drive rod 640.

In one embodiment, the drive member 638 can comprise first and secondgear racks 641 and 642. A first notch 644 can be provided on the drivemember 638 intermediate the first and second gear racks 641 and 642.During return movement of the firing trigger 528, a tooth 646 on thefiring trigger 528 can be engaged with the first notch 644 for returningthe drive member 638 to its initial position after staple firing. Asecond notch 648 can be located at a proximal end of the metal drive rod640 for locking the metal drive rod 640 to the upper latch arm 618 ofthe release button 530 in its unfired position.

In various embodiments, the multiplier 636 can comprise first and secondintegral pinion gears 650 and 652. The first integral pinion gear 650can be engaged with a first gear rack 654 provided on the metal driverod 640 and the second integral pinion gear 652 can be engaged with thefirst gear rack 641 on the drive member 638. The first integral piniongear 650 can have a first diameter and the second integral pinion gear652 can have a second diameter that is smaller than the first diameter.

In various embodiments, FIGS. 18, 20, and 21 illustrate, respectively,the handle portion 520 in the start position (open and unfired), aclamped position (closed and unfired), and a fired position. The firingtrigger 528 can be provided with a gear segment section 656. The gearsegment section 656 can be engaged with the second gear rack 642 on thedrive member 638 such that motion of the firing trigger 528 can causethe drive member 638 to move back and forth between a first driveposition, illustrated in FIG. 20, and a second drive position,illustrated in FIG. 21. In order to prevent staple firing before tissueclamping has occurred, the upper latch arm 618 on the release button 530can be engaged with the second notch 648 on the drive member 638 suchthat the metal drive rod 640 can be locked in its proximal-mostposition, as illustrated in FIG. 18. When the upper latch arm 618 fallsinto the recess 622, the upper latch arm 618 can disengage with thesecond notch 648 to permit distal movement of the metal drive rod 640,as illustrated in FIG. 20.

Because the first gear rack 641 on the drive member 638 and the gearrack 654 on the metal drive rod 640 are engaged with the multiplier 636,movement of the firing trigger 528 can cause the metal drive rod 640 toreciprocate between a first reciprocating position, illustrated in FIG.20, and a second reciprocating position, illustrated in FIG. 21. Sincethe diameter of the first pinion gear 650 is greater than the diameterof the second pinion gear 652, the multiplier 636 can move thereciprocating section 634 a greater distance than the drive member 638is moved by the firing trigger 528. In various embodiments, thediameters of the first and second pinion gears 650 and 652 can bechanged to permit the length of the stroke of the firing trigger 528 andthe force required to move it to be varied.

It will be appreciated that the handle portion 520 is illustrative andthat other actuation mechanisms may be employed. For instance, theclosing and firing motions may be generated by automated means and/orcan be generated by retracting a single trigger that can accomplish bothclosing and firing motions, for example.

In various embodiments, referring to FIGS. 22-28, the end-effectorassembly 512 of the surgical instrument 510 is illustrated in furtherdetail. As described above, the handle portion 520 can produce separateand distinct closing and firing motions that actuate the end-effectorassembly 512. The end-effector assembly 512 can maintain the clinicalflexibility of this separate and distinct closing and firing (i.e.,stapling and severing). In addition, the end-effector assembly 512 canintroduce the aforementioned ability to affirmatively maintain theclosed spacing during firing after the surgeon positions and clamps thetissue within the end-effector assembly 512. Both features procedurallyand structurally enhance the ability of the surgical instrument 510 byensuring adequate spacing for instances where an otherwise inadequateamount of tissue is clamped by the end-effector assembly 512 and toenhance the clamping in instances where an otherwise excessive amount oftissue has been clamped by the end-effector assembly 512.

In one embodiment, FIG. 22 illustrates the end-effector assembly 512,which is in an open position by the retracted closure sleeve 532, withthe staple cartridge 537 installed in the second jaw 516. On a lowersurface 700 of the first jaw 518, one or more rows of stapling formingpockets 702 can be arrayed to correspond to one or more rows of staplecavities 704 in an upper surface 706 of the staple cartridge 537. Thefiring bar 514 is at its proximal position, with the upper pin 538aligned in a noninterfering fashion with the anvil pocket 540. The anvilpocket 540 is illustrated as communicating with the longitudinal anvilslot 542 in the first jaw 518. The distally presented cutting member 548of the firing bar 514 can be aligned with and proximally from removedfrom the vertical slot 549 in the staple cartridge 537, thereby allowingremoval of a spent cartridge and insertion of an unfired cartridge,which can be snap-fit or otherwise fit into the second jaw 516.Specifically, extension features 708 and 710 of the staple cartridge 537can engage recesses 712, 714 (illustrated in FIG. 24) of the second jaw516.

In one embodiment, FIG. 23 illustrates the implement portion 522 and theend-effector assembly 512 of the surgical instrument 510 in disassembledform. The end-effector assembly 512 can comprises the staple cartridge537 illustrated as being comprised of a cartridge body 716, a wedge sled718, drivers 720, staples 722, and a cartridge tray 724. When assembled,the cartridge tray 724 can hold the wedge sled 718, the drivers 720, andthe staples 722 inside the cartridge body 716. Drivers 720 can be usedwhen one staple line is being deployed from a side of the staplecartridge 537 and double drivers can be used with two staple lines arebeing deployed from a side of the staple cartridge 537. Of course, ifthree staple lines are being deployed from each side of the staplecartridge 537, three drivers can be provided and so forth. The drivers720 and the wedge sled 718 together can be referred to herein as driver718 and/or an electrically-conductive driver 718, since they bothfunction to drive staples into tissue positioned within the end-effectorassembly 512.

Having a wedge sled 718 integral to the staple cartridge 537 can enablea number of flexible design options as compared to incorporating cammingsurfaces onto a firing bar itself. For instance, a number of differentstaple cartridges may be selected for use in the surgical instrument 510with each staple cartridge having a different configuration of one ormore rows of staples, each thus having a unique wedge sled configured tocontact the middle pin 546 of the firing bar 514 while causing thedriving of the staples 722.

In one embodiment, the second jaw 516 can have a proximally placedattachment cavity 726 that can receive a channel anchoring member 728 onthe distal end of the frame 534 for attaching the end-effector assembly512 to the handle portion 520. The second jaw 516 can also have an anvilcam slot 730 that can pivotally receive an anvil pivot 732 of the firstjaw 518. The closure sleeve 532 that encompasses the frame 534 cancomprise a distally presented tab 734 that can engage an anvil feature736 proximately on the first jaw 518 but distal to the anvil pivot 732to thereby effect opening and closing of the first jaw 518. The firingdrive member 536 is illustrated as being assembled to the firing bar 514attached to a firing connector 738 by pins 740, which in turn isrotatingly and proximally attached to the metal drive rod 640. Thefiring bar 514 can be guided at a distal end of the frame by a slottedguide 739 inserted therein, for example.

In various embodiments, with particular reference to FIG. 24, a portionof the staple cartridge 537 is removed to expose portions of the secondjaw 516, such as the recesses 712 and 714 and to expose some componentsof the staple cartridge 737 in their unfired position. In particular,the cartridge body 716 (illustrated in FIG. 23) has been removed. Thewedge sled 718 is shown at its proximal, unfired position with a pusherblock 742 contacting the middle pin 546 (not illustrated in FIG. 24) ofthe firing bar 514. The wedge sled 718 can be in longitudinal slidingcontact upon the cartridge tray 724 and can comprise wedges 728 thatforce upward the drivers 720 as the wedge sled 718 moves distally.Staples 722 (not illustrated in FIG. 24) resting upon the drivers 720can thus also be forced upward into contact with the staple formingpockets 702 on the first jaw 518 to form closed staples. Alsoillustrated is the channel slot 545 in the second jaw 516 that can bealigned with the vertical slot 549 in the staple cartridge 537.

In one embodiment, FIG. 25 illustrates the end-effector assembly 512 ofFIG. 24 with all of the staple cartridge 537 removed to show the middlepin 546 of the firing bar 514 as well as portion of the second jaw 516removed adjacent to the channel slot 545 to expose the firing bar cap544. In addition, the shaft 523 is removed to expose a proximal portionof the firing bar 514. Projecting downward from the first jaw 518 nearthe pivot, a pair of opposing tissue stops 744 can prevent, or at leastinhibit, tissue from being positioned too far up into the end-effectorassembly 512 during clamping.

In various embodiments, FIG. 26 illustrates the end-effector assembly512 closed in a tissue clamping position with the firing bar 514unfired. The upper pin 538 can be in the anvil pocket 540, verticallyaligned with the anvil slot 542 for distal longitudinal movement of thefiring bar 514 during firing. The middle pin 546 can be positioned topush the wedge sled 718 distally so that wedge 728 can sequentiallycontact and lift drivers 720 and the respective staples 722 into formingcontact with staple forming pockets 702 in the lower surface 700 of thefirst jaw 518.

In various embodiments, FIG. 27 illustrates the upper surface 706 of thestaple cartridge 537 with the firing bar 514 in its unfired, proximalposition. The one or more staple cavities 704 can be arrayed on eachside of the vertical slot 549 in the staple cartridge 537.

In one embodiment, FIG. 28 illustrates the end-effector assembly 512near the pivot showing that the second jaw 516 has opposing rampportions 746 to thereby cooperate with the tissue stops 744 of the firstjaw 518 (not illustrated in FIG. 28) to prevent tissue from jamming theend-effector assembly 512. Also illustrated in greater detail are thedrivers 720 and their relation to the staples 722.

The features of the surgical instrument 510 which enable sealing oftissue disposed and/or clamped within the end-effector assembly 512 willnow be described. It will be understood by those of skill in the artthat surgical instruments, other than the surgical instrument 510, canbe configured or produced to comprise such sealing features. The presentdisclosure is not limited to the use of such features with the surgicalinstrument 510 and can be used with other surgical instruments.

In one embodiment, referring generally to FIGS. 13-15, 17, 18, 20-22,and 24-35, the surgical instrument 510, can be electrically coupled toan energy source 768 in communication with a controller 770. In variousembodiments, the energy source 768 can provide energy to the surgicalinstrument 510 and at least to one electrode of the end-effectorassembly 512, wherein the magnitude, duration, wave form, and/orfrequency, for example, of the energy can be sufficiently controlled ormodulated, by the controller 770, for example, to provide a desiredamount or type of energy to the surgical instrument 510. The energysource 768 and the energy provided to the surgical instrument 510 can bethe same as or similar to that described herein. Further, the controller770 can be the same as or similar to that described herein. The energysource 768 can be in electrical communication with the surgicalinstrument 510 through first and second conductors 571 and 573 orthrough other suitable methods. The first and second conductors 571 and573 can extend from the energy source 768 to or proximate to theend-effector assembly 512 or to other portions of the surgicalinstrument 510.

In one embodiment, the first conductor 571 can extend proximate to aportion of the firing bar 514 when the firing bar 514 is in theretracted position (see e.g., FIG. 14). In various embodiments, thefirst conductor 571, which can act as the supply or positive conductor,can be engaged with a contact 575 positioned adjacent to the firing bar514. The contact 575 or other conductive element in communication withthe contact 575 can be biased or spring-biased towards the firing bar514 such that energy can be provided to a conductive track 525 in thefiring bar 514, to the firing bar 514 itself, and/or to a conductiveportion of the firing bar 514, for example. By providing such a contact575 and conductive track 525 or conductive portion of the firing bar514, energy can be supplied by the first conductor 571 to a distalportion of the firing bar 514 even when the firing bar 514 is moveddistally within the end-effector assembly 512 into its extended position(see e.g., FIG. 17). In one embodiment, the energized portion of thefiring bar 514, such as the conductive track 525, for example, can besurrounded by an insulative material or a non-conductive material(indicated as “I” in the figures) such that only the conductive track525 is energized, instead of the entire firing bar 514. In other variousembodiments, the entire firing bar 514 can be energized and can besurrounded by an insulative material or a non-conductive material in theappropriate places, such that energy can be directed within theend-effector assembly 512 as necessary.

Various conductors 577, 577′, 577″, and/or other conductors can extendfrom the contact 575 or from portions of the conductive track 525 toenergize various portions of the end-effector assembly 512 or the staplecartridge 537. The conductor 577, if provided, can extend from thecontact 575 or the conductive track 525 to the cutting member 548 tosupply energy to the cutting member 548. The conductor 577′, ifprovided, can extend from the contact 575 or the conductive track 525 tothe driver 718, such as an electrically-conductive staple driver, forexample, to supply energy to the staples 722 when contacted by thedriver 718. The conductor 577″, if provided, can extend from the contact575 or the conductive track 525 to an electrode on or in one of thefirst jaw 518 and the second jaw 516 (or on or in a staple cartridge ofthe second jaw 516) to supply energy to the electrode. In other variousembodiments, the contact 575 or the first conductor 571 can be inelectrical communication with an electrode on the first jaw 518 and/orthe second jaw 516, for example, and may not be in contact with thefiring bar 514. In any event, energy can be supplied to the end-effectorassembly 512 such that tissue can be sealed by the end-effector assembly512.

In various embodiments, the second conductor 573, which can act as thereturn or negative conductor, can extend from the energy source 768 to aportion of the end-effector assembly 512, such as the first jaw 518, forexample. In one embodiment, the second conductor 573 can be inelectrical communication with a contact on the first jaw 518 or can bedirectly attached to the first jaw 518 at a conductive section of thefirst jaw 518. The second conductor 573 can channel energy from theend-effector assembly 512 back to the energy source 768 and/or thecontroller 770, for example. Although the first conductor 571 isdescribed as being the supply or positive conductor and the secondconductor 573 is described as being the return or negative conductor, invarious embodiments, the first conductor 571 can be the return ornegative conductor and the second conductor 573 can be the supply orpositive conductor, for example.

In one embodiment, at least one of the first and second conductors 571and 573, such as the first conductor 571, can comprise a switch 579,optionally engaged with an activation button 764 on the surgicalinstrument 510. The switch 579 can act as a typical switch and candisrupt the flow of energy through the surgical instrument 510 and/orthrough the end-effector assembly 512 of the surgical instrument 510when in an open position. In one embodiment, the switch 579 can be in anormally-open position and the activation button 764, when depressed,can be used to close the switch 579 to complete the circuit between theenergy source 768 and the surgical instrument 510. In other embodiments,full retraction of the closure trigger 526 or the firing trigger 528 canclose the switch 579 or another suitable switch and allow energy to flowto the surgical instrument 510. In any event, the switch 579 can beconfigured to remain closed until a predetermined time has lapsed suchthat energy can flow through portions of the end-effector assembly 512and through the tissue to cause a suitable seal to be formed in thetissue. In one embodiment, the switch 579 can remain closed for apredetermined period of time although the activation button 764 isreleased or although the firing trigger 528 is released and allowed toretract into its unfired state.

In various embodiments, portions of the end-effector assembly 512 and/orportions of the surgical instrument 510 can comprise insulativematerials or non-conductive materials, such as plastic or rubber, forexample. Such insulative materials or non-conductive materials can aidin confining the energy within the end-effector assembly 512 within theconductive portions. For instance, an insulative material can beprovided on the proximal portion of the first jaw 518 such that energycan be returned from the first jaw 518 though the second conductor 573without coming into electrical contact with the firing bar 514, forexample.

In one embodiment, the staples 722 positioned with the staple cavity 704of the second jaw 516 can comprise the first electrode. Althoughreferred to as the “first electrode”, those of ordinary skill in the artwill recognize that each staple 722 or less than all of the staples 722can comprise a first electrode (i.e., only some staples make compriseconductive portions). In various embodiments, the staples 722 cancomprise conductive portions or can be comprised of conductivematerials, such as metals, for example. To allow energy to flow to thestaples 722, the first conductor 571 can supply energy to the contact575. The contact 575 can then supply energy to the firing bar 514, theconductive track 525, and/or to the electrically conductive driver 718optionally using the conductor 577′. In one embodiment, the staples 722can supply energy to the tissue when they are in contact with theelectrically-conductive driver 718. In one embodiment, the staples 722can be removably positioned within staple cavities 704 in the second jaw518 or the staple cartridge 537. In various embodiments, theelectrically-conductive driver 718 can be configured to move each of thestaples 722 between a first stored position in which the staple 722 isat least partially positioned within the staple cavity 704 and a secondposition in which the staples 722 are at least partially deployed fromthe staple cavity 704 into tissue positioned intermediate the first jaw518 and the second jaw 516. In one embodiment, more than one staple 722can be in electrical communication with the electrically-conductivedriver 718 at one time or more than one electrically-conductive drivercan be in communication with the staples 722 at one time. By supplyingenergy to the staples 722, the tissue can be sealed in the area in whichstaple legs of the staples 722 puncture the tissue. Such sealing about aperimeter of the staple legs can decrease bleeding caused by thepuncturing of the tissue by the staple legs. In various embodiments, thestaples 722 and/or the electrically-conductive driver 718 can comprise afuse, such as the PTC material described above, for example, to regulatethe energy flow of the energy from the staples 722 to another electrodewithin the end-effector 512.

In one embodiment, the end-effector assembly 512 and/or the staplecartridge 537 can comprise a second electrode on one of the first jaw518 or the second jaw 516. The second electrode can have the samepolarity or a different polarity than the first electrode. In variousembodiments, a second electrode 754 can be positioned on or form aportion of the first jaw 518 and can be in electrical communication withthe second conductor 573. In such an embodiment, the second electrode754 can receive the energy supplied by the first electrode after suchenergy passes through and seals the tissue. In this configuration,portions of a tissue-contacting surface of the second jaw 516 and/or thestaple cartridge 537 can be comprised of an insulative material suchthat energy flows from the first electrode (e.g., portions of thestaples 722) toward the second electrode 754 on the first jaw 518. Thefirst jaw 518 can comprise a fuse 762, such as the PTC materialdescribed above, to regulate or inhibit the energy flow between thefirst electrode and the second electrode 754. The fuse 762 can bepositioned around or in the pockets of the first jaw 518 and the secondelectrode 754 can be positioned underneath the fuse 762, for example. Insuch an embodiment, a tissue-contacting surface of the first jaw 518 cancomprise an insulative material such that energy can pass from the firstelectrode, through the fuse 762, to the second electrode 754, and thento the second conductor 573.

In one embodiment, the end-effector assembly 512 can comprise a thirdelectrode. In various embodiments, a third electrode 756 can bepositioned on or form the cutting member 548. In other variousembodiments, the third electrode 756′ can be positioned on or form aportion of the second jaw 516. In various embodiments, the thirdelectrode 756 or 756′ can have the same polarity or a different polaritythan the first electrode and/or the second electrode 754, for example.In one embodiment, the third electrodes 756 and 756′ can both beprovided on an end-effector assembly of a surgical instrument. Invarious configurations, energy can flow from the third electrode 756 or756′, through the tissue, toward the first electrode and/or the secondelectrode 754, for example. By providing the third electrode 756 on thecutting member 548, tissue can be sealed as it is cut by the cuttingmember 548 thereby reducing bleeding at the cutting site. In one exampleembodiment, energy can travel from the first electrode (i.e., staples722) and the cutting member (i.e., third electrode 756), through thetissue, and possibly through a fuse, to the second electrode 754 on thefirst jaw 518. The fuse 762 can be positioned adjacent to the secondelectrode 754 on the first jaw 518. In such an embodiment, the firstelectrode and the third electrode 756 can have the same polarity (e.g.,positive) while the second electrode 754 can have a different polarity(e.g., negative). Other polarity configurations of the variouselectrodes are also within the scope of the present disclosure. Invarious embodiments, the various electrodes can be positioned within theend-effector assembly 512 in a fashion such that the flow of energythrough the tissue and the end-effector assembly 512 can be controlledto control the thermal spread caused by the energy flow. As discussedherein, heat can be generated in the tissue by the resistance to energyflow that the tissue creates between the various electrodes.

In an embodiment, where the third electrode 756′ is positioned on thesecond jaw 516, the third electrode 756′ can act as a supply or a returnelectrode. In one embodiment, the third electrode 756′ can be positionedon or in the staple cartridge 537 positioned within the second jaw 516,for example. In other various embodiments, the third electrode 756′ canbe positioned adjacent to a fuse, such as fuse 762, for example. Thefuse 762 can be similar to the fuse 62 discussed herein and can bepositioned more proximal to a tissue-contacting surface of the secondjaw 516 than the third electrode 756′, such that energy can passesthrough the fuse 762 before reaching the third electrode 756′ or canpass through the fuse 762 after leaving the third electrode 756′. Asdiscussed herein with respect to the fuse 62, the fuse 762 can be usedto limit, restrict, and/or stop the energy flow from one electrode toanother.

In one embodiment, temperature measuring devices or sensors, such asthermocouples, RTD's (resistive thermal devices), thermistors, and othersuitable devices can be embedded at strategic locations within theend-effector assembly 512 to sense the temperature of the tissuepositioned within the end-effector assembly 512. As a result, thedelivery of energy to at least one of the electrodes can be controlledin response to feedback from these devices, for example.

In various embodiments, by using more than two electrodes (e.g., threeor four), the thermal spread of heat within the tissue compressedbetween the first jaw 518 and the second jaw 516 can be minimalizedthereby reducing heating of the tissue adjacent to the end-effectorassembly 512. Such minimalization can occur owing to a controlled pathof the energy through the various electrodes.

In various embodiments, in order to direct the energy flow through theend-effector assembly 512 through the various electrodes and the tissueproperly, certain portions of the end-effector assembly 512 can compriseinsulative materials or non-conductive portions. In one embodiment,portions of the tissue-contacting surfaces of the first jaw 518 and thesecond jaw 516 can comprise insulative materials or non-conductiveportions to cause energy to flow from at least one electrode, throughthe fuse 762 or another fuse, to at least one other electrode. In otherembodiments, portions of the first jaw 518 and the second jaw 516adjacent to the electrodes can comprise insulative materials ornon-conductive portions to maintain the energy flow between the variouselectrodes and at least inhibit energy from flowing to other portions ofthe end-effector assembly 512. Those of skill in the art will understandhow and where, in various embodiments, the various insulative materialsor non-conductive portions can be placed within the end-effectorassembly 512.

In one embodiment, referring to FIGS. 36-38, a staple cartridge 737 isillustrated. The staple cartridge can be configured to be positioned onor within the second jaw 518 and can comprise a plurality of staplecavities 704, a plurality of staples 722, and a tissue-contactingsurface 703 comprising an outer perimeter 705. The tissue-contactingsurface 703 can comprise an electrode 707, such as a third electrode,for example. The staple cartridge 737 can also comprise a first side709, a second side 711, and a cutting member slot 749 defined at leastpartially intermediate the first side 709 and the second side 711. Afirst plurality of staples 722 can be at least partially positionedwithin a first plurality of staple cavities 704 in the first side 709.The first plurality of staples 722 can form at least one row of staples722. A second plurality of staples 722 can be at least partiallypositioned within a second plurality of staple cavities 704 in thesecond side 711. The second plurality of staples 722 can form at least asecond row of staples 722. In various embodiments, FIGS. 37 and 38illustrate the staple cartridge 737′ and the staple cartridge 737″,respectively. Like numbers between FIG. 36 and FIGS. 37 and 38 designatelike components.

In one embodiment, referring to FIG. 36, the electrode 707 can bepositioned proximate to the outer perimeter 705 of the staple cartridge737, while the one or more rows of staples 722 can be positioned distalfrom the outer perimeter 705 or closer to the cutting member slot 749than the one or more rows of staples 722. In another embodiment,referring to FIG. 37, the one or more rows of staples 722′ can bepositioned proximate to the outer perimeter 705′ of the staple cartridge737′, while the electrode 707′ can be positioned distal from the outerperimeter 705′ or closer to the cutting member slot 749′ than theelectrode 707′. In one embodiment, referring to FIG. 38, the electrode707″ can be positioned intermediate a first row of staples 722″ and asecond row of staples 722″. In various embodiments, more than one firstrow of staples 722″ can be provided on the first side 709″ of theelectrode 707″ and more than one second row of staples 722″ can beprovided the second side 711″ of the electrode 707″, for example. As aresult of the various embodiments described above, the staples can beapplied more proximal to a cut line in tissue than the seal created bythe electrode (in conjunction with another electrode) or can be appliedmore distal from the cut line while the seal is positioned more proximalto the cut line in the tissue. In one embodiment, it may be desirable tohave the staples positioned in the tissue more distal from the cut linein the tissue than the seal, such that the tissue can be sealedproximate to the cut line to reduce bleeding at the cut line while thestaples provide support to the seal and maintain it in place. In othervarious embodiments, the staples can be deployed directly adjacent to orwithin a seal created in the tissue.

In one embodiment, referring to FIG. 13, the end effector assembly 512can comprise one or more tissue thickness sensors, such as tissuethickness sensors 780 and 781, for example, positioned on theend-effector assembly 512. The tissue thickness sensors 780 and 781 cansense the distance between a tissue-contacting surface of the first jaw518 and a tissue-contacting surface of the second jaw 516 to determinethe thickness of the tissue clamped between the first jaw 518 and thesecond jaw 516. In various embodiments, the sensors 780 and 781 can beany suitable sensors known in the art, such as Hall effect sensors,capacitive sensors, optical sensors, RF sensors, and/or strain gauges,for example. In one embodiment, a signal generated by the sensors 780and 781 can be outputted to a processor, such as a microprocessor, forexample. The processor can interpret the signal to determine thethickness of the tissue clamped between the first jaw 518 and the secondjaw 516. Upon determining the thickness of the tissue, the processor canbe used to control a solenoid that can extend a piston to engage arecess (not illustrated) in the driver 718. Such a feature canessentially lock-out the driver 718 and prevent it from moving from theproximal position (see e.g., FIG. 14) into the extended position (seee.g., FIG. 17) if the tissue thickness is below (i.e., less than) apredetermined tissue thickness threshold. Such a feature can alsoprevent staples 722 from being deployed into tissue that can besufficiently sealed with energy delivered by the various electrodes. Insuch an embodiment, a cutting member can be moved within theend-effector assembly 512 independently from the staple driver. If themeasured tissue thickness is at or above (i.e., thicker) thepredetermined tissue thickness threshold, the staples 722 can bedeployed into the tissue using the driver 718. In various embodiments,the tissue thickness can also be used to determine how long (e.g., inseconds) or how much energy flows (e.g., watts) between the variouselectrodes when activated. For thinner tissue, the duration or strengthof energy flow can be less than when sealing thicker tissue, forexample.

In one embodiment, referring to FIG. 17, one or more staple sensors 782can sense when at least one staple 722 is positioned within at least onestaple cavity 704 (i.e., when the staple is in or at least partially inthe first, undeployed position). The one or more staple sensors 782 canalso be in communication with the processor described above such thatwhen at least one staple 722 is not sensed within at least one staplecavity 704 and the tissue thickness measured by the sensors 780 and 781is at or above the predetermined tissue thickness threshold, a solenoidcan extend a piston to engage a recess in the firing bar 514, a stapledriver, and/or cutting member and restrict or prevent movement of thefiring bar 514, the staple driver, and/or the cutting member between theproximal position (see e.g., FIG. 14) and the extended position (seee.g., FIG. 17). This solenoid mechanism is one example of a lockoutdevice, although other lockout devices known to those of skill in theart are envisioned and are within the scope of the present disclosure.The movement of the firing bar 514, the staple driver, and/or thecutting member can be restricted in that the tissue clamped within theend-effector assembly 512 may be too thick to be sealed merely by theelectrodes without the use of the staples 722. Once the sensor 782senses that at least one staple 722 is present in at least one staplecavity 704, the solenoid can retract the piston from engagement with thefiring bar 514, the staple driver, and/or the cutting member and thefiring bar 514, the staple driver, and/or the cutting member can advancedistally within the end-effector assembly 512 and staples 722 can bedeployed into the tissue using the firing bar 514 or the staple driver718. If the tissue thickness is below the predetermined tissue thicknessthreshold and the sensor 782 indicates that at least one staple 722 isnot present in at least one staple cavity 704, the solenoid may notextend the piston to engage the recess in the firing bar 514, the stapledriver, and/or the cutting member and a seal and a cut may be made inthe tissue, (i.e., no staples are required). Such a feature can at leastinhibit a surgeon from merely sealing tissue using the variouselectrodes when staples should also be deployed into the tissue to aidthe tissue seal owing to the thickness of the tissue. In variousembodiments, the predetermined tissue thickness threshold can be in therange of 0 mm to 4 mm, alternatively in the range of 0.0 mm to 1.0 mm,alternatively in the range of 1 mm to 2 mm, and alternative in the rangeof 2 mm to 3 mm, for example. In other embodiments, the predeterminedtissue thickness threshold can be set at other tissue thicknesses forvarious suitable applications. In various embodiments, more than onestaple sensor 782 can be provided to sense staples in more than onestaple cavity 704. In other various embodiments, a staple cartridgesensor (not illustrated) can be provided to sense the presence of astaple cartridge within the end-effector assembly 512.

In one embodiment, another lockout device can be configured todeactivate the electrode system when the sensed thickness of the tissueis greater than the predetermined tissue thickness threshold and whenthe sensor 782 does not sense a staple 722 in or at least partially inthe first, undeployed position. To accomplish the same, the lockoutdevice can be in electrical communication with the processor and canessentially function as a switch. When the lockout device receives asignal from the processor that the tissue thickness is greater than thepredetermined tissue thickness threshold and/or no staples 722 aresensed in or at least partially in the first position by the sensor 782,the lockout device can interrupt the energy flow to the variouselectrodes of the end-effector assembly 512 by opening a switchpositioned in series with the conductor supplying energy to theelectrode. The lockout device can then allow energy flow to the variouselectrodes when the staples 722 are sensed in or at least partially inthe first position by the sensor 782. Such a feature can prevent, or atleast inhibit, sealing of tissue that is too thick to be sealed withoutthe use of fasteners, such as staples, for example.

In one embodiment, a predetermined tissue sealing time can be associatedwith each tissue thickness or each range of tissue thickness. Forexample, if the tissue thickness is in the range of 3 mm to 8 mm, thetissue sealing time (or time energy is flowing through the end-effectorassembly 512) can be 5 to 10 seconds, for example. In one embodiment,for a 45 mm staple cartridge, the tissue sealing time can be 4 to 15seconds or longer, for example. Longer tissue sealing times may behelpful or required for staple cartridges longer than 45 mm. In variousembodiments, when the energy flow to the end-effector assembly 512 isactivated by retraction of the firing trigger 528, the cutting member548 can be restricted in its movement along the cutting member slot 549in the staple cartridge 537 or the second jaw 516. Such restriction canbe to cause adequate energy flow to the various electrodes and create asuitable seal in the tissue for a predetermined period of time prior toadvancing the cutting member 548. In one embodiment, the speed of thecutting member 548 can be modulated by allowing the cutting member 548to be energized so that energy at the cutting edge enhances thesharpness of the cutting edge. If the cutting member 548 moves tooquickly along the cutting member slot 549, a seal may not be fullyformed in the tissue depending on the thickness of the tissue. Therestriction of the movement of the cutting member 548 can be effected bya resistive member acting on or against the firing bar 514 or anothercutting member, for example. In one embodiment, the resistive member cancomprise a biasing or biased member that pushes against a side surfaceor other portion of the firing bar 514 or another cutting member tocreate a frictional resistance to proximal to distal movement of thefiring bar 514 or another cutting member. In other embodiments, magnetscan be used as the resistive member to restrict proximal to distalmovement of the firing bar 514 or another cutting member.

In use, in one embodiment, the surgical stapling and severing instrument510 can be used as illustrated in FIGS. 13, 14, and 29-35. In FIGS. 13and 14, the surgical instrument 510 is in its initial position, havinghad an unfired, fully loaded staple cartridge 537 snap-fitted orotherwise fitted into the distal end of the second jaw 516. Both of thetriggers 526, 528 are forward and the end-effector assembly 512 is open,such as would be typical after inserting the end-effector assembly 512through a trocar or other opening into a body cavity of a patient. Thesurgical instrument 510 can then be manipulated by the surgeon such thattissue 748 to be stapled, sealed, and/or severed is positioned betweenthe staple cartridge 537 and the first jaw 518, as illustrated in FIG.29.

In various embodiments, referring to FIGS. 30 and 31, next, the surgeoncan move the closure trigger 526 proximally until it is positionedadjacent or directly adjacent to the pistol grip 524, thereby lockingthe handle portion 520 into the closed and clamped position. Theretracted firing bar 514 in the end-effector assembly 512 may not impedethe selective opening and closing of the end-effector assembly 512, butrather resides within the anvil pocket 540. With the first jaw 518closed and clamped, the firing bar 514 can be aligned for firing throughthe end-effector assembly 512. In particular, the upper pin 538 can bealigned with the anvil slot 542 and the second jaw 516 can beaffirmatively engaged about the channel slot 545 by the middle pin 546and the firing bar cap 544.

In one embodiment, referring to FIGS. 32 and 33, after tissue clampinghas occurred, the surgeon can move the firing trigger 528 proximally tocause the firing bar 514 to move distally into the end-effector assembly512. In particular, the middle pin 546 can enter the staple cartridge537 through the firing drive slot 547 to effect the firing of thestaples 722 (not illustrated in FIGS. 32 and 33) via wedge sled 718toward the first jaw 518. The lower most pin, or firing bar cap 544, cancooperate with the middle pin 546 to slidingly position cutting member548 of the firing bar 514 to sever the tissue 748. The firing bar cap544 and middle pin 546 can also position the upper pin 538 of the firingbar 514 within the longitudinal anvil slot 542 of the first jaw 518,affirmatively maintaining the spacing between the first jaw 518 and thesecond jaw 516 throughout its distal firing movement.

In one embodiment, referring to FIGS. 34 and 35, the surgeon cancontinue moving the firing trigger 528 until brought proximal to theclosure trigger 526 and the pistol grip 524. As a result, all of theends of the staples 722 can be deformed owing to their engagement withthe first jaw 518. The firing bar cap 544 can be arrested against afiring bar stop 750 projecting toward the distal end of the channel slot545. In such a position, the cutting member 548 has traversed completelythrough the tissue 748. The process can be completed by releasing thefiring trigger 528 and by then depressing the release button 530 whilesimultaneously squeezing the closure trigger 526 to open theend-effector assembly 512.

In one embodiment, the retraction of the firing trigger 528 can activatethe electrode system of the surgical instrument 510 by closing a switchin the first conductor 571, for example, thereby allowing energy fromthe energy source 768 to flow to and through the end-effector assembly512 and back to the energy source 768. The energy can flow from oneelectrode, such as the first electrode, in electrical communication withthe first conductor 571, flow through the tissue clamped within theend-effector assembly 512 to create a seal in the tissue, and flow tothe second electrode 754, for example. In other embodiments, the energycan flow to a third or a fourth electrode depending on the electrodeconfiguration within the end-effector assembly 512. The energy can thenflow back to the energy source 768, thereby completing the circuitbetween the surgical instrument 510 and the energy source 768.

In other various embodiments, referring to FIG. 13, the energy can flowto the end-effector assembly 512 and at least one electrode thereof whenthe activation button 764 is depressed. Depression of the activationbutton 764 can close the switch 579 in the first conductor 571 to allowenergy to flow the end-effector assembly for a predetermined amount oftime or as long as the activation button 764 is depressed by thesurgeon.

The present disclosure has been illustrated by describing severalembodiments and while the example embodiments have been described indetail, it is not the intention of the applicants to restrict or in anyway limit the scope of the appended claims to such detail. Additionaladvantages and modifications will be readily apparent to those of skillin the art.

For example, the affirmative spacing of the first jaw 518 and the secondjaw 516 can be achieved in part with two pins 544 and 546 on the firingbar 514 engaging opposite sides of a channel slot and a single upper pin538 entrained within an first jaw slot 542. It would be consistent withaspects of the present disclosure for a first jaw to be captured byopposing pins on either side of a longitudinal slot and/or for a secondjaw to have an internal slot that entrains a lower pin.

As another example, although the firing bar 514 has various advantagesfor an endoscopically employed surgical instrument 510, a similar firingbar may be used in other clinical procedures. It is generally acceptedthat endoscopic procedures are more common than laparoscopic procedures.Accordingly, the present disclosure has been discussed in terms ofendoscopic procedures and apparatuses. However, use herein of terms suchas “endoscopic,” should not be construed to limit the present disclosureto a surgical instrument for use only in conjunction with an endoscopictube (i.e., trocar). On the contrary, it is believed that the presentdisclosure may find use in any procedure where access is limited to asmall incision, including but not limited to laparoscopic procedures, aswell as open procedures.

As still another example, although an illustrative handle portion 520described herein is manually operated by a surgeon, it is consistentwith aspects of the present disclosure for some or all of the functionsof a handle portion to be powered (e.g., pneumatic, hydraulic,electromechanical, ultrasonic, robotic etc.). Furthermore, controls ofeach of these functions can be manually presented on a handle portion orbe remotely controlled (e.g., wireless remote, automated remote console,etc.), for example.

In one embodiment, referring to FIGS. 39-41, 47, and 48, a surgicalinstrument, such as surgical instrument 910, can comprise an elongateshaft 912 comprising a first proximal end 914 and a second distal end916. A handle portion 918 can extend from the first end 914 and anend-effector 920 or an end-effector assembly can extend from the secondend 916. In various embodiments, the surgical instrument 910 can be usedto sever and/or join tissue or layers of tissue. In various embodiments,the surgical instrument 910 can be used to create a seal in tissue. Inone embodiment, the surgical instrument 910 can be operably connected toan energy source 968 such that energy can flow to the end-effector 920to seal tissue and then flow back to the energy source 968. Such energyflow and the energy source 968 can be the same as or similar to thatdescribed herein with respect to surgical instrument 510 and the energysource 768, for example. The energy source 968 can be operativelyconnected with a controller 970, which can be the same as or similar tothe controllers 70 and/or 770 described above.

In one embodiment, the handle portion 918 can comprise an articulationknob 919 configured to rotate the end-effector 920 about a longitudinalaxis of the elongate shaft 912. Such articulation can be useful inpositioning the end-effector 920 during a surgical procedure. The handleportion 918 can also comprise a trigger 922 and a trigger 923. Thetrigger 922 can be used to close the end-effector 920 and clamp orcompress tissue therein, while the trigger 923 can be used to distallyadvance a cutting member to cut tissue positioned within theend-effector 920 and/or distally advance a rivet driver to deploy orfire rivets from the end-effector 920 and into the tissue. In variousembodiments, the cutting member can be part of the rivet driver, forexample. In one embodiment, the trigger 923 can be geared such that morethan one stroke of the trigger 923 can be used to distally advance thecutting member and/or the rivet driver. In other embodiments, only onetrigger may be provided and that trigger can close the end-effector 920and also distally advance the cutting member and/or the rivet driver. Invarious embodiments, the handle portion 918 or one of the triggers cancomprise an activation button 964, as described herein.

In one embodiment, still referring to FIGS. 39-41, 47 and 48, theend-effector 920 can comprise a first jaw 926 and a second jaw 928. Atleast one of the first jaw 926 and the second jaw 928 can be movedtoward each other by retraction of the trigger 922, for example, tothereby compress or clamp tissue positioned therebetween. In oneembodiment, the first jaw 926 can be moved or pivoted toward the secondjaw 928 to compress tissue therebetween. Such tissue compression can aidin sealing the tissue using rivets or electrodes in that the compressioncan reduce the amount of water in the tissue and can reduce thethickness of the tissue at locations in the tissue where a rivet line ora seal is to be formed. In one embodiment, the first portion 926 cancomprise an anvil comprising anvil pockets 958. The anvil pockets 958can be formed in the first portion 926 and can be configured to deformportions of rivets or staples. In other embodiments, the anvil pockets958 may not be provided and a face of the anvil can deform and/or meltportions of the rivets. In one embodiment, formation of rivet heads canbe dependent on the shape of the anvil pockets 958. Cubical-shaped anvilpockets can create cubical-shaped rivet heads and half sphere-shapedanvil pockets can create half sphere-shaped rivet heads, for example.Other shapes of the rivet heads are also envisioned within the scope ofthe present disclosure. In various embodiments, the first portion 926can comprise a first electrode 954 and an optional fuse 962, such as thePTC material, for example, as discussed in further detail herein. Invarious embodiments, one or more insulative materials can also beprovided on the face or other portions of the first jaw 926 to properlydirect the energy flow within the end-effector 920. In otherembodiments, the first electrode 954 can be at least a portion of thefirst portion 926, for example.

In one embodiment, the second jaw 928 can comprise a rivet cartridgereceiving portion 929 configured to receive or at least partiallyreceive a rivet cartridge 949 in a snap-fit or a press-fit fashion, forexample. In various embodiments, the rivet cartridge 949 and/or therivet cartridge receiving portion 929 can comprise a second electrode960 and an optional fuse 962, such as the PTC material, for example, asdiscussed in further detail herein. In certain embodiments, the fuse 962can be provided on both of the first portion 926 and the second portion928 or on one of the first portion 926 and the second portion 928. Therivet cartridge 949 and/or the second jaw 928 can also comprise one ormore insulative materials to help direct the energy between theelectrodes 954 and 960 or between other various electrodes. Although thepresent disclosure discusses the rivet cartridge 949 comprising rivets,it will be understood that the rivet cartridge 949 can also comprisestaples or other fasteners in addition to the rivets. Such a cartridgemay be suitable for various surgical procedures. Also, although therivet cartridge 949 is illustrated and described herein, it will beunderstood that rivet cavities can be formed in the second jaw 928 andthat a separate rivet cartridge may not be required. Further, those ofskill in the art will understand that the rivet cartridge 949, ifprovided, can be formed with or formed on the second jaw 928. As such,an end-effector or a surgical instrument used to deploy rivets can beprovided with or without the rivets and/or with or without the rivetcartridge 949. In various embodiments, the rivet cartridge 949 can bedisposable or can be reusable after being reloaded with rivets.

In one embodiment, referring to FIGS. 39-41, the trigger 922 can beretracted proximally to close the end-effector 920 and compress tissue“T” between the first jaw 926 and the second jaw 928. Once suitabletissue compression in the end-effector 920 is achieved, using a tissuecompression indicator and/or a rivet formation indicator 927, forexample, the trigger 923 can be retracted proximally one or more times(i.e., more than one stroke) to drive a cutting member 940 and a driver942 distally within the end-effector 920. A stroke of the trigger 923could advance the driver 942 ⅓ of the length of the rivet cartridge 949,for example. Such actuation can cause the driver 942 to move rivets 938within the rivet cartridge 949 between a first position in which therivets 938 can be at least partially positioned within a rivet cavity946 and a second position in which the rivets 938 can be at leastpartially deployed from the rivet cavity 946. This can cause the rivets938 to form a rivet line 941 in the tissue “T” by formation of the rivetheads 969, as illustrated in one example embodiment in FIG. 40, and asdiscussed in further detail herein. The rivet heads 969 can be formed bydeforming and/or melting portions of the rivets 938. In one embodiment,the rivet heads 969 and/or other portions of the rivets 938 can bemelted and/or deformed at temperatures in the range of about 107° F. toabout 121° F., for example. In other embodiments, the rivet heads 969and/or other portions of the rivets 938 can be melted and/or deformed attemperatures in the range of about 100° C. to about 220° C., greaterthan about 50° C., or less than about 100° C. In the latter embodiment,the tissue being anchored by the rivets 938 may need to be insulatedfrom this higher heat such that overheating or burning of the tissuedoes not occur. In still other embodiments, other suitable meltingand/or deforming temperatures of the rivets 938 can be used depending onthe material(s) of the rivets 938 as will be recognized by those ofskill in the art. The actuation of the trigger 923 can also cause thecutting member 940 to advance distally within the end-effector 920 andsever or incise the tissue “T”, again as illustrated in one exampleembodiment in FIG. 40. In one embodiment, the driver 942 and the cuttingmember 940 can be formed of a single component or can be formed of morethan one component. In any event, both the cutting member 940 and thedriver 942 can be configured to be driven distally within theend-effector 920 upon retraction of the trigger 923 or other suitabletrigger.

The general operation of a surgical instrument, such as surgicalinstrument 910 is described in further detail herein and in U.S. Pat.No. 7,000,818 to Shelton et al., entitled SURGICAL STAPLING INSTRUMENTHAVING SEPARATE CLOSING AND FIRING SYSTEMS, which issued on Feb. 21,2006, the entire disclosure of which is incorporated herein by referencein its entirety. The surgical instrument 910 can also operate in otherfashions and still be within the scope of the present disclosure.Surgical instruments operably engaged with energy sources are describedin greater detail above.

In one embodiment, referring to FIGS. 42 and 43, the rivet cartridge 949is illustrated. The rivet cartridge 949 can be configured to be engagedwith, attached to, or formed with an end-effector of a surgicalinstrument, such as the end-effector 920 of the surgical instrument 910,for example. In one embodiment, the rivet cartridge 949 can beconfigured to be positioned within the receiving portion 929 of thesecond portion 928. In one embodiment, although not illustrated, therivet cartridge 949 can be engaged with, attached to, or formed with thefirst portion 926 and the second portion 928 can act as the anvil, forexample. In various embodiments, the rivet cartridge 949 can comprise afirst surface 950 defining one or more openings 952 therein and a secondsurface 953. One or more of the rivet cavities 946 can be defined atleast partially intermediate the first surface 950 and the secondsurface 953. In one embodiment, the one or more rivet cavities 946 canextend from the first surface 950 to the second surface 953. The one ormore rivet cavities 946 can be in communication with the openings 952 inthe first surface 950. The rivet 938 can be removably positioned withineach of the rivet cavities 946 and/or the openings 952 or less than eachof the rivet cavities 946 and/or the openings 952. FIG. 43 illustrates across-sectional view of the rivet cartridge 949 taken along line 43-43of FIG. 42. In FIG. 43, none of the rivets 938 have been fully deployedfrom the rivet cartridge 949. As such, the rivets 938 are illustrated inthe stored position, or substantially in the stored position. In otherembodiments, the rivet cartridge 949 can comprise other suitableconfigurations.

In various embodiments, referring to FIG. 44 as an example, the rivet938 can comprise a tissue-engaging portion 955, an elongate portion 957extending from the tissue-engaging portion 955, and a meltable and/ordeformable portion 959. In one embodiment, the elongate portion 957 cancomprise or form the meltable and/or deformable portion 959. Themeltable and/or deformable portion 959 can be deformed by the firstportion 926 or the anvil pockets 958 of the first portion 926 and/ormelted by heat generated within the end-effector 920. In variousembodiments, the rivet 938 can comprise a base 961 comprising atissue-engaging surface 975. In such an embodiment, the tissue-engagingportion 955 of the rivet 938 can comprise a first end 963 and a secondend 965, such that the elongate portion 957 extends from the first end963 and the base 961 extends from the second end 965. In one embodiment,a base of the rivets can comprise a camming surface configured to beengaged with the driver 942 or a camming surface on the driver 942 todrive the rivets into tissue and against the first portion 926.

In one embodiment, the rivets 938 can comprise a meltable and/or adeformable material. Example materials can comprise collagen, keratin,synthetic absorbable and non-absorbable polymers, amorphous (as opposedto crystalline) thermoplastics, such as Noryl (blend of polyphenyleneoxide and polystyrene), ABS (acrylonitrile butadiene styrene),polycarbonate, Ultem (polyetherimide), and/or polystyrene, for example,although other suitable materials can also be used. In one embodiment,the materials of the rivets 938 can comprise polylactic acid (PLA), highdensity polyethylene (HDPE), poly(lactic-co-glycolic acid) (PLGA),polyether ether ketone (PEEK), ethylene-vinyl acetate (EVA), and/orpolyethylene oxide (PEO), for example. In various embodiments, therivets 938 can comprise meltable and/or deformable portions, such as themeltable and/or deformable portion 959 and the elongate portion 957, forexample. In one embodiment, the rivets 938 comprising the meltableand/or deformable material can have portions thereof melted through heatgenerated in the end-effector 920 by the resistance to energy flowthrough the tissue. In other embodiments, the rivets 938 comprising themeltable and/or deformable material can have portions thereof deformedby the first portion 926. In one embodiment, the rivets 938 can compriseabsorbable and/or dissolvable materials, such as collagen, keratin,and/or synthetic absorbable materials, for example. These variousmaterials can comprise biologically active components, for example. As aresult of the usage of such materials, after the rivets 938 are deployedinto the tissue and the end-effector 920 is removed from the surgicalsite, the rivets 938, over time, can be absorbed and/or dissolved intotissue and/or the body. In other various embodiments, the rivets 938 cancomprise or can be coated with a medication, a therapeutic agent, and/ora collagen-based material to aid the tissue surrounding the rivets 938in the healing process.

In one embodiment, the rivets 938 can comprise a tissue-puncturing tip967 or tissue-piercing tip on the meltable and/or deformable portion 959or on the elongate portion 957. The tissue-puncturing tip 967 can beconfigured to pierce tissue and/or buttress material, such as acollagen-based buttress material, for example, when forced into thetissue by the driver 942. In various embodiments, the tissue-puncturingtip 967 can be comprised of the same material as the meltable and/ordeformable portion 959 and/or the elongate portion 957 or can becomprised of a different material, such as titanium or otherbiocompatible alloy, for example. In an embodiment where thetissue-puncturing tip 967 comprises the same materials as the meltableand/or deformable portion 959 or other meltable and/or deformablematerials, it may be advantageous to first cut the tissue and thenenergize the end-effector and deploy the rivets 938 to prevent, or atleast inhibit, the tissue-puncturing tip 967 from melting prior to beingdeployed into the tissue, for example.

In one embodiment, FIGS. 45 and 46 illustrate the rivets 938 in theprocess of being deployed or fired into tissue compressed intermediatethe first jaw 926 and the second jaw 928. In various embodiments, therivets 938 can be moved from the first stored position into a seconddeployed positioned using the driver 942. As illustrated in FIG. 46, theextent to which the rivets heads 969 of the rivets 938 are formed can bebased on the tissue thickness where a particular rivet 938 is deployedinto the tissue “T.” Stated another way, in various embodiments, therivets heads 969 can be melted and/or deformed more in thinner areas ofthe tissue and melted and/or deformed less in thicker areas of thetissue. Such adjustability of rivet head formation can allow a suitablebond to be formed in the tissue regardless of the thickness of thetissue where a particular rivet 938 is deployed. In one embodiment, theelongate portion 957 of the rivets 938 can have a first circumferentialperimeter when the rivets 938 are in the first, stored position (i.e.,the undeployed position) and can have a meltable and/or deformableportion 959 that has a second circumferential perimeter when the rivets938 are moved into the second position (i.e., the deployed position). Insuch an embodiment, the second circumferential perimeter of the meltableand/or deformable portion 959 can be greater than the firstcircumferential perimeter of the elongate portion 957 after the rivethead 969 is formed. In one embodiment, the meltable and/or deformableportion 959 of the rivet 938 can have a first axial length when therivet 938 is in the first stored position and can have a second axiallength when the rivet 938 is in the second deployed position after therivet head 969 is formed. The first axial length of the meltable portion959 can be greater than the second axial length of the meltable and/ordeformable portion 959 when the meltable and/or deformable portion 959is at least partially melted or deformed. In various embodiments, thebase 961 can form the other rivet head on the side of the tissueproximate to the second portion 928. In other embodiments, a rivet headcan be formed on the rivet on the side of the tissue proximate to thesecond portion 928 by the driver 942 applying pressure to the rivetwhile deploying the rivet and/or by heat created within the end-effector920. In any event, either a base or a rivet head is generally present onboth ends of the various rivets when the rivets are deployed intotissue, such that the rivets remain within the tissue.

In one embodiment, the rivets 938 and the driver 942 can be comprised ofor can comprise a conductive or electrically conductive portion suchthat energy can pass to the driver 942 and to the rivets 938 when thedriver 942 is in contact with the rivets 938. In such an embodiment, therivets 938 can be deformable, for example. Such a feature allows therivets 938 to seal tissue as the rivets 938 are forced through thetissue by the driver 942, similar to that described above with respectto the staples 72.

In one embodiment, referring to FIGS. 47 and 48, an exampleconfiguration of a first face 944 of the first jaw 926 (FIG. 47) and asecond face 956 of the second jaw 928 (FIG. 48) is illustrated. Invarious embodiments, the first jaw 926 can comprise the first electrode954 and optionally can comprise the fuse 962, such as the PTC material,for example, positioned at least partially over the first electrode 954.The cutting member 940 can be moved through a cutting member channel 980when forced distally within the end-effector 920 by the driver 940. Inone embodiment, the anvil pockets 958 can be formed in the first face944. These anvil pockets 958 can be configured to receive the meltableand/or deformable portion 959 and/or the elongate portion 957 of therivet 938 and deform and/or melt the same. Although, the anvil pockets958 of FIG. 47 are illustrated as being dome-shaped, those of skill inthe art will recognized that anvil pockets can be any other suitableshape configured to deform and/or melt portions of the rivet 938 andform the rivet head 969 in tissue. In one embodiment, the shape of therivet heads 969 can be dependent on the shape of the anvil pockets 958.In other embodiments, the shape of the rivet heads 969 can be dependenton the shape of the meltable and/or deformable portion 959 and/or theelongate portion 957. The first face 944 can comprise an insulatormaterial thereon to aid in directing energy from the first electrode 954to the second electrode 960 with minimal thermal spread of the heatgenerated between the electrodes 954 and 960.

In one embodiment, referring to FIG. 48, the second face 956 of thesecond portion 928 can comprise the rivet cavities 946 which can eachcomprise the rivet 938 removably positioned therein. As discussed above,the rivet cavities 946 can be defined in the second portion 928 ordefined in a rivet cartridge that can be attached to or engaged with thesecond portion 928. The second portion 928 can comprise the fuse 962,such as PTC material, for example, and can also comprise or can becomprised of the second electrode 960. In general, the fuse 962 isusually provided on only one of the first portion 926 and the secondportion 928, although, in some embodiments, the fuse 962 can be providedon both of the first portion 926 and the second portion 928. Forexample, the second portion 928 can comprise conductive portionsunderneath the fuse 962. Similar to the first face 944, the second face956 can comprise an insulator material thereon to aid in directingenergy from the first electrode 954 to the second electrode 960 withminimal thermal spread of the heat generated between the electrodes 954and 960.

In various embodiments, the rivets 938 in the rivet cavities 946 can bedeployed by the driver 942 from the second portion 928 toward the firstportion 926 or toward the anvil pockets 958 such that portions thereofcan be deformed by the anvil pockets 958. In other embodiments, therivets 938 can be deformed by the first face 944 of the first portion926. At the same time, before, or after the rivets 938 are deployed intothe tissue, the first electrode 954 or the second electrode 960 can beenergized to supply energy to the tissue and to the first electrode 954or the second electrode 954. The energy can be supplied to the firstelectrode 954 and returned from the second electrode 960 or can besupplied to the second electrode 960 and returned from the firstelectrode 954 similar to or the same as that described above. Anactivation button 964 (FIG. 39) can also be used to allow the energy topass through the end-effector 920, similar to or the same as thatdescribed above. In one embodiment, various lockouts or lockout devicescan also be provided in the rivet firing trigger 923 or in theactivation button 964 similar to or the same as that described above.

In the example embodiments of FIGS. 47 and 48, the rivets 938 and theanvil pockets 958 are illustrated in a linear fashion and positionedoutwardly from the first electrode 954, the second electrode 960, andthe fuse 962. Such example embodiments are not intended to limit thescope of the present disclosure. In fact, the rivets 938 and the anvilpockets 958 can be positioned in a linear or non-linear fashionoutwardly or inwardly from the first electrode 954, the second electrode960, and the fuse 962, for example. In certain other embodiments, two ormore lines of the rivets 938 can be provided. If two or more lines ofthe rivets 938 are provided, a first line of the rivets 938 can bestaggered or off-set from the second line of the rivets 938 such that abetter seal can be created in the tissue by reducing the spacing of gapsbetween the rivets 938. In one embodiment, one or more lines of therivets 938 can be positioned on each side of the seal, for example.Furthermore, spacing between one rivet 938 and another rivet 938 mayvary according to a particular surgical purpose of the rivets 938. Asdiscussed above, in certain embodiments, staples or other suitablefasteners may also be used to compliment the rivets 938.

In one embodiment, referring to FIGS. 49 and 50, another example of afirst portion 926′ that can be used with the second portion 928 of FIG.48 is provided. In such an embodiment, anvil pockets 958′ can be definedin a first face 944′. The anvil pockets 958′ can have a rectangular orsubstantially rectangular opening at or proximate to the first face 944′to produce a rivet line 941′ having rivet heads 969′ in the tissue “T”as illustrated in FIG. 50. The tissue can also comprise a seal 976′produced by the electrodes and a cut line 973′ produced by the cuttingmember 940 when the cutting member 940 is moved along the cutting memberchannel 980′.

In one embodiment, referring to FIGS. 51 and 52, another example of afirst portion 926″ that can be used with the second portion 928 of FIG.48 is provided. In such an embodiment, anvil pockets 958″ can be definedin a first face 944″. Channels 971″ can be defined in the first face944″ intermediate a first anvil pocket 958″ and a second anvil pocket958″. The anvil pockets 958″ can have a circular or substantiallycircular opening at or proximate to the first face 944″ to produce arivet line 941″ having rivet heads 969″ in the tissue “T” connected byelongate members 981″ as illustrated in FIG. 52. The elongate members981″ can be formed by portions of the rivets 938″ being melted and/orbeing deformed within the channels 971″. As can be seen in FIG. 52, therivets 938″ of the rivet line 941″ can be connected to each other fromthe rivet material melted within the channels 971″. As a result, therivet line 941″ can be robust and can create an appropriate seal in thetissue or layers of tissue. Such a rivet line 941″ can also protect, byproviding structural support to the tissue “T”, the seal 976″ formed inthe tissue “T” around the cut line 973″ by the various electrodes. Thecut line 973″ can be formed by the cutting member 940 moving along thecutting member channel 980″.

In one embodiment, referring to FIGS. 53 and 54, another example of afirst portion 926′″ that can be used with the second portion 928 of FIG.48 is provided. In such an embodiment, anvil pockets 958′″ can bedefined in a first face 944′″. One anvil pocket 958′″ can touch or bepositioned very proximal to another anvil pocket 958′″ to form a rivetline 941′″ in the tissue “T” as illustrated in FIG. 54. The anvilpockets 958′″ can have an elongate opening at or proximate to the firstface 944′″ to produce the rivet line 941′″ having rivet heads 969″. Ascan be seen from FIG. 54, the rivet heads 969′″ of the rivets 938′″ canbe connected to each other from the rivet material melted within theanvil pockets 958′″. As a result, the rivet line 941′″ can be robust andcan create an appropriate seal in the tissue or layers of tissue. Such arivet line 941′″ can also protect, by providing structural support tothe tissue, a seal 976′″ formed in the tissue by the various electrodesaround the cut line 973′″. The cut line 973′″ can be formed by thecutting member 940 moving along a cutting member channel 980′″. Those ofskill in the art will recognize that other suitable patterns of rivetsand/or rivet lines are within the scope of the present disclosure.

In one embodiment, referring to FIGS. 55A-55C, a rivet 938 isillustrated. The rivet 938 is illustrated in the undeployed, undeformed,and/or unmelted state in FIGS. 55A and 55B and is illustrated, in oneexample embodiment, in a deployed, deformed, and/or melted state in FIG.55C. In one embodiment, the rivet 938 can comprise a tissue-puncturingtip 967, a meltable and/or deformable portion 959, an elongate portion957, a tissue-engaging portion 955, and a base 961. The tissueengaging-portion 955 can comprise a first end 963 and a second end 965.The elongate portion 957 can extend from the first end 963 and the base961 can extend from the second end 965. The base 961 can comprise atissue-engaging surface 975. The meltable and/or deformable portion 959and possibly a portion of the elongate portion 957 can be deformed bythe first face of the first portion and the driver and can be at leastpartially melted by heat within the end-effector generated by theresistance to the energy flow that the tissue provides intermediate thefirst electrode and the second electrode. In such an embodiment, theelongate portion 957 and/or the meltable and/or deformable portion 959can form a rivet head 969 while the base 961 can form the other rivethead.

In one embodiment, referring to FIG. 46, a buttress material “B”, suchas a collagen-based buttress material, for example, can be positionedintermediate the first jaw 926 and the second jaw 928 and/or can beattached to one of the first jaw 926 and the second jaw 928. Thetissue-puncturing tip 967 or other various tissue-puncturing tips can beconfigured to puncture not only the tissue, but also the buttressmaterial when the rivet 938 is deployed towards the first portion 926.Such use of the collagen-based buttress material can aid the healingprocess in the area near the cut line 973 or where the rivets 938 havepunctured the tissue. Such a buttress material can be used with any ofthe other rivets or end-effectors of the present disclosure in the sameor a similar fashion.

In one embodiment, referring to FIGS. 56A-56C, a rivet 1038 isillustrated. The rivet 1038 is illustrated in the undeployed,undeformed, and/or unmelted state in FIGS. 56A and 56B and isillustrated, in one example embodiment, in a deployed, deformed, and/ormelted state in FIG. 56C. In one embodiment, the rivet 1038 can comprisea tissue-puncturing tip 1067, a meltable and/or deformable portion 1059,an elongate portion 1057, a tissue-engaging portion 1055, a secondelongate portion 1057′, and a second meltable and/or deformable portion1059′. The tissue engaging-portion 1055 can comprise a first end 1063and a second end 1065. The elongate portion 1057 can extend from thefirst end 1063 and the second elongate portion 1057′ can extend from thesecond end 1065. The meltable and/or deformable portions 1059 and 1059′and possibly a part of the elongate portions 1057 and 1057′ can bedeformed and/or melted by the first face of the first portion and thedriver and can be melted by heat within the end-effector generated bythe resistance to the energy flow that the tissue provides intermediatethe first electrode and the second electrode. In such an embodiment, theelongate portions 1057 and 1057′ and/or the meltable and/or deformableportions 1059 and 959′ can form rivet heads 1069 and 1069′.

In one embodiment, referring to FIGS. 57A-57C, a rivet 1138 isillustrated. The rivet 1138 is illustrated in the undeployed,undeformed, and/or unmelted state in FIGS. 57A and 57B and isillustrated, in one example embodiment, in a deployed, deformed, and/ormelted state in FIG. 57C. In one embodiment, the rivet 1138 can besimilar to the rivet 938, but can comprise a base 1161 comprising acamming surface 1166 configured to be engaged with the driver or acamming surface on the driver to drive the rivets 1138 into tissue. Inone embodiment, such a camming surface 1166 can be provided on all ofthe rivets of the present disclosure.

In one embodiment, referring to FIGS. 58A-58C, a rivet 1238 is provided.The rivet 1238 is illustrated in the undeployed, undeformed, and/orunmelted state in FIGS. 58A and 58B and is illustrated, in one exampleembodiment, in a deployed, deformed, and/or melted state in FIG. 58C. Inone embodiment, the rivet 1238 can be similar to the rivet 1038, but cancomprise a different tissue-puncturing tip 1267 and a meltable and/ordeformable portion 1259 configured to be formed into a rivet head 1269.

In one embodiment, referring to FIGS. 59A-59C, a rivet 1338 is provided.The rivet 1338 is illustrated in the undeployed, undeformed, and/orunmelted state in FIGS. 59A and 59B and is illustrated, in one exampleembodiment, in a deployed, deformed, and/or melted state in FIG. 59C. Inone embodiment, the rivet 1338 can be similar to the rivet 1238, but cancomprise two tissue-puncturing tips 1367 and 1367′ and a differentlyshaped meltable and/or deformable portion 1359 configured to be formedinto a rivet head 1369.

Although the rivets and rivet cartridges have been discussed herein withrespect to the surgical instrument 910, it will be understood that therivets and rivet cartridges disclosed herein can be used with otherlinear cutting instruments, other linear cutting and sealinginstruments, or other circular stapling instruments, such as thecircular stapling instrument 10, for example. In a circular staplinginstrument, the rivet cartridge can be circular or substantiallycircular such that it can be positioned within a receiving slot definedin the first portion 26 or the second portion 28 of the surgicalinstrument 10, for example. In one embodiment, the rivet cartridgesdiscussed herein can be disposable or reloadable after use.

While the present disclosure has been illustrated by description ofseveral example embodiments and while the example embodiments have beendescribed in considerable detail, it is not the intention of theapplicants to restrict or in any way limit the scope of the appendedclaims to such detail. Additional advantages and modifications may bereadily apparent to those of skill in the art. Furthermore, although theexample embodiments disclosed herein have been described in connectionwith various surgical instrument, other embodiments are envisioned inconnection with other suitable medical devices and/or surgicalinstruments, such as a linear cutter for open surgery techniques, asdisclosed in U.S. Patent Application Publication No. 2010/0072251 toBaxter et al., entitled LOCKOUT ARRANGEMENT FOR A SURGICAL STAPLER,filed on Sep. 19, 2008, the entire disclosure of which is herebyincorporated by reference. Furthermore, adjustable staple formationheight technology can be used with the present disclosure. Exampleembodiments of the adjustable staple formation height technology aredisclosed in U.S. Patent Application Publication No. 2010/0032470 toHess et al., entitled SURGICAL STAPLING SYSTEMS AND STAPLE CARTRIDGESFOR DEPLOYING SURGICAL STAPLES WITH TISSUE COMPRESSION FEATURES, filedon Oct. 16, 2009, the entire disclosure of which is hereby incorporatedby reference. While this disclosure has been described as havingexemplary designs, the disclosure may be further modified within thespirit and scope of the disclosure. This application is thereforeintended to cover any variations, uses, or adaptations of the disclosureusing its general principles. Further, this disclosure is intended tocover such departures from the present disclosure as come within knownor customary practice in the art to which this disclosure pertains.

The various embodiments of the present disclosure have been describedabove in connection with cutting-type surgical instruments. It should benoted, however, that in other embodiments, the surgical instrumentsdisclosed herein need not be a cutting-type surgical instrument. Forexample, it could be a non-cutting endoscopic instrument, a grasper, astapler, a clip applier, an access device, a drug/gene therapy deliverydevice, an energy device using ultrasound, RF, laser, etc. In certainembodiments, an ultrasonic instrument can be utilized in accordance withthe embodiments disclosed herein. In one such embodiment, an ultrasonicinstrument can comprise a first portion comprising a handle portionand/or end effector, for example, and a second portion comprisingradiation-sensitive electronics. Various ultrasonic instruments aredisclosed in U.S. Pat. No. 6,063,098 to Houser et al., entitledARTICULATABLE ULTRASONIC SURGICAL APPARATUS, which issued on May 16,2000, the entire disclosure of which is hereby incorporated by referencein its entirety. Adjustable height staples and/or adjustable heightstaple formation technology may also be used with the embodiments of thepresent disclosure. An examples of such technology is disclosed in U.S.patent application Ser. No. 12/622,113 to Bedi et al., entitled SURGICALSTAPLER COMPRISING A STAPLE POCKET, filed on Nov. 19, 2009, the entiredisclosure of which is incorporated herein by reference in its entirety.Although the present disclosure has been described herein in connectionwith certain disclosed embodiments, many modifications and variations tothose embodiments may be implemented. For example, different types ofend effectors may be employed. Also, where materials are disclosed forcertain components, other materials may be used. The foregoingdescription and following claims are intended to cover all suchmodification and variations.

Further to the above, the various staple cartridges and/or rivetcartridges disclosed herein can be disposable. In one embodiment, anexpended staple cartridge or rivet cartridge, or an at least partiallyexpended staple cartridge or rivet cartridge, can be removed from asurgical stapler and replaced with another staple cartridge or rivetcartridge. In other various embodiments, the staple cartridge or rivetcartridge may not be removable and/or replaceable during the ordinaryuse of the surgical instrument but, in some circumstances, may bereplaceable while and/or after the surgical stapler is reconditioned asdescribed in greater detail below. In various embodiments, the staplecartridge or rivet cartridge can be part of a disposable loading unit orend-effector which can comprise a staple cartridge carrier or rivetcartridge carrier, an anvil, a cutting member, and/or a staple or rivetdriver. In one embodiment, the entire, or at least a portion of, thedisposable loading unit or end-effector can be detachably connected to asurgical instrument and can be configured to be replaced.

The surgical instruments disclosed herein can be designed to be disposedof after a single use, or they can be designed to be used multipletimes. In either case, however, the surgical instruments can bereconditioned for reuse after at least one use. Reconditioning cancomprise any combination of the steps of disassembly of the surgicalinstruments, followed by cleaning or replacement of particular pieces,and subsequent reassembly. In particular, the surgical instruments canbe disassembled, and any number of the particular pieces or parts of thesurgical instruments can be selectively replaced or removed in anycombination. Upon cleaning and/or replacement of particular parts, thesurgical instruments can be reassembled for subsequent use either at areconditioning facility, or by a surgical team immediately prior to asurgical procedure. Those skilled in the art will appreciate thatreconditioning of a surgical instrument can utilize a variety oftechniques for disassembly, cleaning/replacement, and reassembly. Use ofsuch techniques, and the resulting reconditioned surgical instrument,are all within the scope of the present disclosure.

Although the various embodiments of the devices have been describedherein in connection with certain disclosed embodiments, manymodifications and variations to those embodiments may be implemented.For example, different types of end effectors may be employed. Also,where materials are disclosed for certain components, other materialsmay be used. Furthermore, according to various embodiments, a singlecomponent may be replaced by multiple components, and multiplecomponents may be replaced by a single component, to perform a givenfunction or functions. The foregoing description and following claimsare intended to cover all such modification and variations.

Any patent, publication, or other disclosure material, in whole or inpart, that is said to be incorporated by reference herein isincorporated herein only to the extent that the incorporated materialsdoes not conflict with existing definitions, statements, or otherdisclosure material set forth in this disclosure. As such, and to theextent necessary, the disclosure as explicitly set forth hereinsupersedes any conflicting material incorporated herein by reference.Any material, or portion thereof, that is said to be incorporated byreference herein, but which conflicts with existing definitions,statements, or other disclosure material set forth herein will only beincorporated to the extent that no conflict arises between thatincorporated material and the existing disclosure material.

What is claimed is:
 1. An end-effector assembly configured to beattached to a surgical instrument, the end-effector assembly comprising:a first jaw; a second jaw comprising a staple cavity, wherein at leastone of the first jaw and the second jaw is movable relative to the otherjaw; a staple removably positioned within the staple cavity, wherein thestaple comprises an electrode; and an electrically-conductive driverconfigured to move the staple between a first stored position in whichthe staple is at least partially positioned within the staple cavity anda second position in which the staple is at least partially deployedfrom the staple cavity into tissue positioned intermediate the first jawand the second jaw.
 2. The end-effector assembly of claim 1, wherein theelectrode comprises a first electrode, and wherein one of the first jawand the second jaw comprises a second electrode.
 3. The end-effectorassembly of claim 2, wherein the second electrode is positioned adjacentto a positive temperature coefficient material.
 4. The end-effectorassembly of claim 2, wherein the first electrode is configured to have adifferent polarity than the second electrode.
 5. The end-effectorassembly of claim 1, wherein the electrode comprises a first electrode,the end-effector assembly comprising a cutting member one of formed withand operably engaged with the electrically-conductive driver, whereinone of the first jaw and the second jaw comprises a second electrode,and wherein the cutting member comprises a third electrode.
 6. Theend-effector assembly of claim 1, wherein the electrically-conductivedriver is in electrical communication with the electrode when moving thestaple between the first position and the second position.
 7. Theend-effector assembly of claim 1, comprising a tissue thickness sensorconfigured to sense a thickness of the tissue positioned intermediatethe first jaw and the second jaw, wherein the staple optionally remainsin the first position when the sensed thickness is less than apredetermined tissue thickness threshold, and wherein the staple ismoved into the second position when the sensed thickness is greater thanthe predetermined tissue thickness threshold.
 8. The end-effectorassembly of claim 7, comprising: a cutting member one of attached to andformed with the electrically-conductive driver, wherein the cuttingmember is movable along a cutting path to form a cut line in the tissue;a staple sensor configured to sense when the staple is in the firstposition; and a lockout device configured to selectively restrictmovement of the cutting member along the cutting path when the sensedthickness is greater than the predetermined tissue thickness thresholdand when the staple sensor indicates that the staple is not in the firstposition.
 9. The end-effector assembly of claim 1, comprising: a cuttingmember configured to travel along a cutting path; and a resistive memberconfigured to restrict the speed of the travel of the cutting memberalong the cutting path.
 10. The end-effector assembly of claim 9,wherein the resistive member comprises one of a biasing member and amagnet.
 11. The end-effector assembly of claim 1, wherein the electrodecomprises a first electrode, the end-effector assembly comprising astaple cartridge comprising: the staple cavity; the staple; and atissue-contacting surface, wherein the tissue-contacting surfacecomprises a second electrode.
 12. The end-effector assembly of claim 1,comprising a staple cartridge comprising: a tissue-contacting surfacehaving an outer perimeter; a first side; a second side; a cutting memberslot defined at least partially intermediate the first side and thesecond side; a first plurality of staples at least partially positionedwithin a first plurality of staple cavities in the first side, whereinthe first plurality staples form at least a first row of staples; and asecond plurality of staples at least partially positioned within asecond plurality of staple cavities in the second side, wherein thesecond plurality of staples form at least a second row of staples. 13.The end-effector assembly of claim 12, wherein the electrode comprises afirst electrode, the end-effector assembly comprising a second electrodeon the tissue-contacting surface, wherein the second electrode ispositioned proximate to the outer perimeter of the tissue-contactingsurface, and wherein the first row of staples and the second row ofstaples are positioned distal from the outer perimeter of thetissue-contacting surface.
 14. The end-effector assembly of claim 12,wherein the electrode comprises a first electrode, the end-effectorassembly comprising a second electrode on the tissue-contacting surface,wherein the first row of staples and the second row of staples arepositioned proximate to the outer perimeter of the tissue-contactingsurface, and wherein the second electrode is positioned distal from theouter perimeter of the tissue-contacting surface.
 15. An end-effectorassembly configured to be engaged with a surgical instrument, theend-effector assembly comprising: a first jaw; a second jaw comprising astaple cavity, wherein at least one of the first jaw and the second jawis movable relative to the other jaw; a staple removably positionedwithin the staple cavity, wherein the staple comprises a firstelectrode; and an electrically-conductive driver configured to deploythe staple at least partially from the staple cavity into tissuepositioned intermediate the first jaw and the second jaw; and whereinone of the first jaw and the second jaw comprises a second electrode.16. The end-effector assembly of claim 15, wherein the staple comprisesa first staple, the end-effector assembly comprising a second stapleremovably positioned within the staple cavity, wherein the second staplecomprises a third electrode, and wherein the electrically-conductivedriver is movable within the end-effector assembly between a firstposition in which the electrically-conductive driver is in electricalcontact with the first staple and a second position in which theelectrically-conductive driver is in electrical contact with the secondstaple.
 17. The end-effector assembly of claim 15, wherein the firstelectrode is configured to have a different polarity than the secondelectrode, the end-effector assembly comprising a positive temperaturecoefficient material configured to selectively restrict an electricalcurrent flow between the first electrode and the second electrode. 18.An end-effector assembly configured to be engaged with a surgicalinstrument, the end-effector assembly comprising: an electrode systemcomprising an electrode; a staple deploying system, comprising: a staplecavity; a staple removably positioned within the staple cavity; and astaple driver configured to move the staple between a first position inwhich the staple is stored at least partially within the staple cavityand a second position in which the staple is at least partially deployedfrom the staple cavity; a staple sensor configured to sense when thestaple is in the first position; a tissue thickness sensor configured tosense a thickness of tissue positioned within the end-effector assembly;and a lockout device configured to deactivate the electrode system whenthe sensed thickness is greater than a predetermined tissue thicknessthreshold and when the staple sensor does not sense the staple in thefirst position.
 19. The end-effector assembly of claim 18, wherein theelectrode is a first electrode, wherein the staple comprises a secondelectrode, and wherein the staple driver comprises an electricallyconductive portion configured to be placed in electrical contact withthe second electrode.
 20. The end-effector assembly of claim 18, whereinthe staple deploying system is configured to deploy the staple into thetissue when the sensed thickness is greater than the predeterminedtissue thickness threshold and when the staple sensor senses the staplein the first position.
 21. An end-effector assembly configured to beattached to a surgical instrument, the end-effector assembly comprising:a first jaw; a second jaw, wherein at least one of the first jaw and thesecond jaw is movable relative to the other jaw; a staple removablypositioned within the second jaw, wherein the staple comprises anelectrode; and an electrically-conductive driver configured to deploythe staple into tissue positioned intermediate the first jaw and thesecond jaw.
 22. The end-effector assembly of claim 21, wherein one ofthe first jaw and the second jaw comprises a second electrode.
 23. Anend-effector assembly configured to be engaged with a surgicalinstrument, the end-effector assembly comprising: an electrode systemcomprising an electrode; a staple deploying system, comprising: a staplecavity; a staple removably positioned within the staple cavity; and astaple driver configured to move the staple between a first position inwhich the staple is stored at least partially within the staple cavityand a second position in which the staple is at least partially deployedfrom the staple cavity; a staple sensor configured to sense when thestaple is in the first position; a tissue thickness sensor configured tosense a thickness of tissue positioned within the end-effector assembly;and a lockout device configured to deactivate the electrode system whenat least one of the sensed thickness is greater than a predeterminedtissue thickness threshold and the staple sensor does not sense thestaple in the first position.
 24. A staple cartridge for use with asurgical instrument comprising a first jaw and a second jaw, the staplecartridge comprising: a cartridge body, comprising: a staple removablypositioned within the cartridge body, wherein the staple comprises anelectrode; and an electrically-conductive driver configured to deploythe staple into tissue positioned intermediate the first jaw and thesecond jaw.